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 '''Ms. Chono''', known in the English version of the [[Yu-Gi-Oh! Dungeon Dice Monsters|''Dungeon Dice Monsters'' video game]] video game as '''Miss Lynn Medusa''', is a teacher at Domino High School. She is known as the "'''The Wicked Witch of Expel" ''' ("'''Lynn, the Expelling Witch" ''' in the English ''DDM '' game), since she expelled fifteen students in over the last course of six months. Her beautiful appearance is due to the immensely thick layer of makeup she wears, which covers her true, ugly face. She also enjoys dating, but the part she likes the best was to dump the men to see them cry. Typically, she is an extreme somewhat sadist.

[[File:Ms._Chono_true_faceChono true face.jpg|left|thumb|110px|Ms. Chono's true face]]In the manga, Ms. Chono was furious about getting dumped by a man she dated, before she got a chance to do it the other way around, and decided to vent her anger on the students with a desk check, hoping to see them scared and finding a chance to expel them for finding "cool" things such as cigarettes, lipsticks, and condoms. She found a [[love jigsaw puzzle]] on [[Miho Nosaka|Miho]]'s desk, and asked who it belonged to. She claimed that if the sender would confess, she may forgive him (, which was a lie-she planned to expel the sender anyway). [[Yugi MutoMutou (manga)|YugiMutou]], [[Joey WheelerKatsuya Jonouchi (manga)|Katsuya Jonouchi]], and [[Tristan TaylorHiroto Honda (manga)|Hiroto Honda]] all stood up, and indicated that the puzzle came from each of them. Not believing them, Chono decided to finish the puzzle to determine who the gift was from. [[Yami Dark Yugi(manga)|Dark Yugi]] turned the gift into a [[Shadow Game]]. The more , where Chono felt the pain she was inflicting on others as she worked at on the puzzle, the more her makeup started to turn into pieces. When she finished the puzzle, her makeup turned into puzzle pieces and fell off, revealing her ugly face beneath. The other students laughed at her. She ran , causing her to run out of the room, stating that the class never happened, and that she would get anyone who expose exposes her secret.<ref>{{chapter|Yu-Gi-Oh!|7|ref}}</ref>

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<div style="float:right">[[ImageFile:Ms. Chono.jpg|thumb|180px|Ms. Chono in the anime]]</div>In the anime, the gift was supposed to be from a girl named [[Mayumi]] to Jonouchi but [[Téa Gardner|Anzu]] actually made it as Mayumi didn't know what to give Jonouchi. When Anzu complains about the strictness of the school, Chono asks Anzu to collect signatures from other students in a petition asking for laxer rules. Chono then orders some boys to rip up Anzu's signature paper. Dark Yugi challenges Chono to a game involving two mirrors and being blindfolded. Her face cracks after cheating (she took off her blindfold during the game) to reveal her ugly face.<ref>{{episode|Yu-Gi-Oh!|10|ref}}</ref> She later appears with [[Ryuichi Fuha]] and again gets her face cracked again.<ref>{{episode|Yu-Gi-Oh!|12|ref}}</ref> {{clear}}