{{Infobox/Yu-Gi-Oh!/Episodeepisode | season image = 1Vrains 017.png | image name caption = Vrains 017[[Skye Zaizen|Blue Angel]] faces off against [[Prototype Red-B]].png | en_name = Blue's Back| kanji = 完全無欠のＡＩデュエリスト | ruby japanese ja_name = {{Ruby|完|かん}}{{Ruby|全|ぜん}}{{Ruby|無|む}}{{Ruby|欠|けつ}}の{{Ruby|Ａ|エー}}{{Ruby|Ｉ|アイ}}デュエリスト | romaji romaji_name = Kanzen Muketsu no Ēai Dyuerisuto | japanese translated ja_trans_name = Flawless AI Duelist | english series = Yu-Gi-Oh! VRAINS | japanese air date number = September 6, 201717 | english air date season = 1 | japanese opening ja_opening = [[With The Wind]] | english opening = | japanese ending ja_ending = [[Believe In Magic]] | english ending en_theme = Yu-Gi-Oh! VRAINS Main Theme | screenwriter = [[Atsushi Maekawa]] | director = [[Kimiharu Muto]] | storyboard artist storyboard_artist = [[Tsukasa Sunaga]] | animation director animation_director =

'''"Blue's Back"''', known as "'''Flawless AI Duelist'''" in the Japanese version, is the seventeenth episode of the ''[[Yu-Gi-Oh! VRAINS]]'' anime. It first aired in Japan on September 6, 2017. It , became available with official subtitles via Crunchyroll on the same day, and aired in Canada on October 27, 2018.

{{Episode summary|[[Aoi Skye Zaizen|Blue Angel]] rushes to [[Yusaku Fujiki|Playmaker]], who is having troubles against the AI programs. Thanks to her, Playmaker is able to get out of a pinch and reach the inner depths of the mother computer. However, when Playmaker reaches the data bank, a certain [[Akira Zaizen|character]] stands in his way...}}

== Featured Duels ==

=== Playmaker vs. Prototype AiGreen-A ==={{Duelprev|Featured Duel: Playmaker vs. Prototype AiGreen-A}} Playmaker has 4000 [[LP]] and controls no cards. Prototype Green-A has 3500 LP and controls "[[Tentacluster Nautilus]]" (0/↙↓↘) in the [[Extra Monster Zone]] and "[[Tentacluster Drillworm]]" (600/1200) in [[Defense Position]].

Playmaker activates [[activate]]s the [[effect ]] of "[[Dual Assembwurm (anime)|Dual Assembwurm]]" in his [[Graveyard|GY]], [[banish]]ing two other [[Cyberse ]] monsters from his hand and/or field GY to [[Special Summon ]] it with , but its ATK becomes halved. He banishes "[[Linkslayer Dotscaper (anime)|LinkslayerDotscaper]]" and "[[Dotscaper Linkslayer (anime)|DotscaperLinkslayer]]" in his GY to [[, and Special Summon]] Summons "Dual Assembwurm" (2800 → 1400/1000) in [[Attack Position]]. As "Dotscaper" was banished, Playmaker activates its effect to , Special Summon Summoning it (0/2100) in . Playmaker activates the [[Defense PositionEquip Spell]]. Playmaker then activates the effect of "[[Cynet Defrag]]" in , [[pay]]ing half his LP to activate it from the GY(Playmaker: 4000 → 2000 LP), paying half his [[LPtarget]] to Special Summon 1 ing a [[Level ]] 4 or lower Cyberse monster in his GY and Special Summoning it in [[Defense Position and ]], then [[equip]] ping "Cynet Defrag" to that monster (Playmaker: 4000 → 2000 LP)it. He targets, Special Summons , and equips "Cynet Defrag" to "[[Flick Clown (anime)|Flick Clown]]" (1000/1400). As Playmaker has no cards in his [[hand]], he activates the effect of "Flick Clown", paying 1000 LP to [[draw a card ]] (Playmaker: 2000 → 1000 LP).

At this point, Playmaker enters the [[Data Storm]]. As Playmaker 's LP is 1000 or less, he activates his his [[Skill]] "Storm Access", which allows him to randomly access accessing a card Cyberse [[Link Monster]] at random from a Data Storm when his LP is 1000 or lessa nearby Data Storm and adding it to his [[Extra Deck]]. Playmaker He obtains "[[Vector Square Scare Archfiend (anime)|Vector Square Archfiend]]" and adds it to his [[Extra Deck]].

Playmaker uses [[Link Material|sets]] "Dual AssembwurmDotscaper", "DotscaperDual Assembwurm", and "Flick Clown" in the [[Link Arrow]]s to [[Link Summon]] "[[Vector Scare Archfiend (anime)|Vector Square Scare Archfiend]]" (2400/LINK-3/↙↑→) to the Extra Monster Zone. Playmaker [[Normal Summons Summon]]s "[[Cyberse Wizard (anime)|Cyberse Wizard]]" (1800/800) to the bottom-left Link Point of "Vector Square Archfiend". "Cyberse Wizard" attacks [[attack]]s and destroys "[[Tentacluster Drillwormdestroy]]s "Drillworm". , then "Vector Square Scare Archfiend" attacks and destroys "[[Tentacluster Nautilus]]" (AiGreen-A: 3500 → 1100 LP). As "Vector Square Scare Archfiend" destroyed a Green-A's monster by [[battle]], Playmaker activates its effect, letting him [[Tribute |Tributing]] a monster to Special Summon the destroyed monster to an opponentGreen-A's [[zone it ]] "Vector Scare Archfiend" [[points to and let it ]], then "Vector Scare Archfiend" can attack again in a row, on that monster again. He Tributes "Cyberse Wizard" to , then Special Summon Summons "Nautilus" to the zone the top -center Link Point Arrow of "Vector Square Scare Archfiend".points to. "Vector Square Scare Archfiend" attacks and destroys "Nautilus" (AiGreen-A: 1100 → 0 LP).

=== Blue Angel vs. Prototype AiRed-B ===

[[Skye Zaizen|Blue Angel activates ]] [[activate]]s the [[Field Spell Card|Field Spell]] "[[Trickstar Light Stage (anime)|Trickstar Light Stage]]". As it was activated, Blue Angel activates its effect to add [[Add a card|adding]] a "[[Trickstar]]" [[monster ]] from her deck [[Main Deck|Deck]] to her [[hand]]. She adds "[[Trickstar Lilybell (anime)|Trickstar Lilybell]]". As "Lilybell" was added to her Blue Angel's hand except by [[Draw a method other than card|drawing]] it, Blue Angel she activates its [[effect to ]], [[Special Summon ]]ing it (800/2000). Blue Angel [[Normal Summons Summon]]s "[[Trickstar Candina (anime)|Trickstar Candina]]" (1800/400). As it "Candina" was Normal Summoned, Blue Angel activates the its effect of "Candina", to add 1 adding a "Trickstar" card from her deck Deck to her hand, adding . She adds "[[Trickstar Vision]]". Blue Angel uses [[Link Material|sets]] "CandinaLilybell" and "LilybellCandina" to Link Summon in the [[Link Arrow]]s to [[Link Summon]] "[[Trickstar Holly Angel (anime)|Trickstar Holly Angel]]" (2000/LINK-2/↙↘) to the Extra the [[Extra Monster Zone]]. Blue Angel activates the [[Spell Card ]] "[[Trickstar Vision]]" to , Special Summon Summoning a "Trickstar" monster from her hand with , but its effects negated and [[ATK ]] becomes halved, also it has its effects [[negate]]d, then letting both players draw each player draws a card. Blue Angel She Special Summons "[[Trickstar Narkissus (anime)|Trickstar Narkissus]]" (1000 → 500/1800), draws, then subsequently Sets her drawn both players draw a card. Blue Angel [[Set]]s a card. Blue Angel activates the effect of "[[Trickstar Lycoris (anime)|Trickstar Lycoris]]" in her hand, revealing [[reveal]]ing it to return , then [[target]]ing a different "Trickstar" monster on her field she controls to her hand and Special Summon "Lycoris"it, then [[return]] that monster to the hand. Blue Angel returns She targets "Narkissus" to her hand and , Special Summons "Lycoris" (1600/1200) to the [[zone]] the bottom-left Link Point Arrow of "Holly Angel" (1600/1200)[[points to]], and returns "Narkissus" to her hand. As Each time a "Trickstar" monster was is Normal or Special Summoned to a zone "Holly Angel" points to, its effect activates, inflicting inflicts 200 [[Effect damage|damage ]] to Ai[[Prototype Red-B. As a "Trickstar" monster inflicted effect damage to Ai|Red-B, the effect of "Light Stage" activates, inflicting 200 more damage ]] (AiRed-B: 4000 → 3800 → 3600 LP). As Ai-B took effect damage, Blue Angel activates the effect of "Narkissus" in her hand to Special Summon it (1000/1800). '''<u>Turn 2: Ai-B</u>'''<br />As a card(s) was added to Ai-B's hand, the effect of "Lycoris" activates, inflicting 200 damage for each card added, with "Light Stage" inflicting 200 more (Ai-B: 3600 → 3400 → 3200 [[LP]]). As Ai-B took damage from the effect of Each time a "Trickstar" monster, the effect of "Holly Angel" activates, increasing its ATK equal to the damage taken until the End Phase ("Holly Blue Angel": 2000 → 2200 ATK). Ai-B activates the controls inflicts [[Continuous Spell CardBattle damage|battle]] "[[Abyss Invitation]]". Ai-B activates the effect of "[[Tentacluster Darkwhip]]" (100/500) in its hand, paying 500 LP to Special Summon it (Ai-B: 3200 → 2700 LP). As a monster in Aior effect damage to Red-B's hand activated its effect, the effect of "NarkissusLight Stage" activates, inflicting inflicts 200 damage after the effect resolves to him (AiRed-B: 2700 3800 → 2500 3600 LP). As a player Red-B took 500 or less effect damage, the effect of "Abyss Invitation" activates, inflicting 200 damage to Blue Angel (Blue Angel: 4000 → 3800 LP). The effect of "Light Stage" activates (Ai-B: 2500 → 2300 LP), followed by the effect of "Holly AngelNarkissus" ("Holly Angel": 2200 → 2400 ATK)in her hand, then the effect of "Abyss Invitation" (Blue Angel: 3800 → 3600 LP). Ai-B then activates the Spell Card "[[Machine Duplication (later anime)|Machine Duplication]]" to Special Summon two copies of a Machine monster with 500 or less ATK on the field from its Deck. It Special Summons two more copies of "Darkwhip" Summoning it (1001000/500 each1800). Ai-A uses the three copies of "Darkwhip" to Link Summon "[[Tentacluster Nautilus]]" (0/LINK-3/↙↓↘) to the Extra Monster Zone. As "Nautilus" was Link Summoned, AI-B activates its effect to Special Summon a "[[Tentacluster]]" monster from its hand to a zone it points to. It She Special Summons "it in [[Tentacluster BlastsuckerDefense Position]]" (400/400) to the bottom Link Point of "Nautilus". Ai-B then Normal Summons a second copy of "Blastsucker" to the bottom-left Link Point of "Nautilus". Ai-B then activates the effect of "Nautilus", letting it destroy all monsters "Nautilus" points to. As a Link Monster's effect that targets it on the field is activated, Ai-B activates the effect of "Blastsucker", destroying it to inflict 400 damage to Blue Angel (Blue Angel: 3600 → 3200 LP). The effect of "Abyss Invitation" then activates (Blue Angel: 3200 → 3000 LP). The effect of the other "Blastsucker" activates, followed by the effect of "Abyss Invitation" (Blue Angel: 3000 → 2600 → 2400 LP).

Ai'''<u>Turn 2: Red-B</u>'''<br />Red-B draws. Each time a card is added to Red-B activates 's hand, the effect of "Lycoris" inflicts 200 damage to him for each (Red-B: 3600 → 3400 → 3200 LP). As Red-B took damage by a "Trickstar" monster's effect, the first effect of "BlastsuckerHolly Angel" in activates, increasing its GY, banishing it ATK equal to inflict 400 the damage to Blue Angel he took, until the end of this [[turn]] (Blue "Holly Angel": 2400 2000 → 2000 LP2200 ATK). The effect of Red-B activates the [[Continuous Spell]] "[[Abyss Invitation]]" . Red-B activates the effect of "[[Tentacluster Darkwhip]]" in its hand, [[pay]]ing 500 LP to Special Summon it (Blue Angel100/500) (Red-B: 2000 3200 → 1800 2700 LP). As Each time Red-B activates a monster effect in Ai-B's his hand or [[GY activated its effect]], the effect of "Narkissus" activates, inflicting inflicts 200 damage to Ai-B him immediately after it [[resolve]]s (AiRed-B: 2700 → 2500 → 2300 → 2100 LP). As a player took 500 or less effect damage by the effect of another card, followed by the effect of "Abyss Invitation" activates, inflicting 200 damage to Blue Angel (Blue Angel: 1800 4000 → 3800 → 1600 3600 LP), then "Light Stage" (Ai. As Red-B: 2100 → 1900 LP), then took damage by a "Abyss InvitationTrickstar" again (Blue Angel: 1600 → 1400 LP)monster's effect, then the effect of "Holly Angel" activates, increasing its ATK equal to the damage he took, until the end of this turn ("Holly Angel": 2200 → 2400 → 2600 ATK). AiRed-B activates the effect Spell "[[Machine Duplication (later anime)|Machine Duplication]]", targeting a [[Machine]] monster he controls with 500 or less ATK and Special Summoning up to two monsters from his Deck with the same name as that [[face-up]] monster. He targets "Darkwhip" and Special Summons two copies of "Darkwhip" (100/500). Red-B sets three copies of "Darkwhip" in the second Link Arrows to Link Summon "Blastsucker[[Tentacluster Nautilus]]" in his GY (Blue Angel: 1400 → 1000 LP0/↙↓↘), then to the effects of Extra Monster Zone. As "Abyss InvitationNautilus"was Link Summoned, Red-B activates its effect, Special Summoning a "[[Tentacluster]]" monster from his hand to his zone "Nautilus" points to. He Special Summons "[[Tentacluster Blastsucker]]" (400/400) to a zone "NarkissusNautilus", and points to. Red-B Normal Summons "Abyss InvitationBlastsucker" activate(400/apply once again in successive order400) to a zone "Nautilus" points to. Red-B activates the effect of "Nautilus", followed by targeting all monsters it points to and destroying them. He targets two copies of "Light StageBlastsucker" and . As a Link Monster's effect is activated that targets the two copies of "Abyss InvitationBlastsucker" once againon the field, Red-B activates their effects, destroying them, and then "Holly inflicting 400 damage to Blue Angel" following after (Blue Angel: 1400 3600 → 1000 3200 → 800 → 600 → 400 2800 LP; Ai-B: 1900 → 1700 → 1500 LP; ). As a player took 500 or less effect damage by the effect of another card, the effect of "Abyss Invitation"Holly activates, inflicting 200 damage to Blue Angel (Blue Angel": 2800 → 2600 → 2800 ATK2400 LP).

AiRed-B activates the Continuous Spell Card effect of "Blastsucker"in his GY, [[Flexible Tentaclusterbanish]]ing it to inflict 400 damage to Blue Angel (Blue Angel: 2400 → 2000 LP, Red-B: 2300 → 2100 → 1900 LP). As a player took 500 or less effect damage by the effect of another card, the effect of "Abyss Invitation"activates, inflicting 200 damage to Blue Angel (Blue Angel: 2000 → 1800 → 1600 → 1400 LP). While activeAs Red-B took damage by a "Trickstar" monster's effect, the effect of "Holly Angel" activates, increasing its ATK equal to the damage he took, Aiuntil the end of this turn ("Holly Angel": 2400 → 2600 ATK). Red-B does not take activates the first instance effect of battle "Blastsucker" in his GY, banishing it to inflict 400 damage it would take per to Blue Angel (Blue Angel: 1400 → 1000 LP, Red-B: 1900 → 1700 → 1500 LP). As a player took 500 or less effect damage by the effect of another card, the effect of "Abyss Invitation" activates, inflicting 200 damage to Blue Angel (Blue Angel: 1000 → 800 → 600 → 400 LP). As Red-B took damage by a "Trickstar" monster's effect, the effect of "Holly Angel" activates, increasing its ATK equal to the damage he took, until the end of this turn("Holly Angel": 2600 → 2800 ATK). It also allows AiRed-B to Special Summon activates the Continuous Spell "[[Flexible Tentacluster]]", and activates its effect, targeting one of its his banished "Tentacluster" monstersand Special Summoning it in [[Attack Position]]. It activates the latter effect to He targets and Special Summon Summons "Blastsucker" (400/400). "Blastsucker" attacks [[attack]]s "Lycoris". As AiRed-B's monster is attackingdeclared an attack, Blue Angel activates her [[face-down ]] [[Trap]] "[[Trickstar Cascade]]", returning a "Trickstar" card she controls to her the hand to [[negate]] the attack. She returns "Light Stage" to her handand negates the attack of "Blastsucker".

Blue Angel Normal Summons "Candina" (1800/400). As it "Candina" was Normal Summoned, she Blue Angel activates the its effect of "Candina" to add , adding a "Trickstar" card from her Deck to her hand, adding . She adds "[[Trickstar Temptation]]". Blue Angel uses sets "Narkissus" and "Lycoris" in the Link Arrows to Link Summon "[[Trickstar Black Catbat (anime)|Trickstar Black Catbat]]" (2000/LINK-2/←→) to the zone the bottom-left Link Point Arrow of "Holly Angel". The first effect of "Holly Angel" activates points to (AiRed-B: 1500 → 1300 LP). As a player took 500 or less effect damage by the effect of another card, followed by the effect of "Abyss Invitation" activates, inflicting 200 damage to Blue Angel (Blue Angel: 400 → 200 LP). As Red-B took damage by a "Trickstar" monster's effect, then the third effect of "Holly Angel" activates, increasing its ATK equal to the damage he took, until the end of this turn ("Holly Angel": 2000 → 2200 ATK). As AiRed-B took damage from the effect of by a "Trickstar" monster's effect, the effect of "Black Catbat" activates, decreasing reducing the ATK of each of Aiall face-B's up monsters he controls by 200 for each monster "Black Catbat" points to , until the end of this turn. "Black Catbat" points to "Candina" ("Blastsucker": 400 → 200 ATK). As Blue Angel controls a "Trickstar" monster, she activates the [[Quick-Play Spell Card]] "[[Trickstar Temptation]]", returning targeting a monster with on the field whose current ATK is different from its [[original ATK ]] and returning it to the hand. Blue Angel He targets and returns "Blastsucker". "Holly Angel" attacks and destroys "Nautilus". Each turn, the first time Red-B would take battle damage from an attack involving his "Tentacluster" monster, with the effect of "Flexible Tentacluster" causing Ai-B to take no battle damage prevents him from that taking it. The attackcontinues and "Nautilus" is destroyed. "Black Catbat" attacks Red-B [[Direct attack|directly ]] (AiRed-B: 1300 → 0 LP).

* ''[[Vector Square Scare Archfiend (anime)|Vector Square Scare Archfiend]]''

{{Decklist|Blue Angel (Aoi Skye Zaizen)

{{Decklist|Prototype AiGreen-A

{{Decklist|Prototype AiRed-B