Yusei's invitation from the IFS Duel League.
The IFS Duel League, (ＩＦＳデュエルリーグ, Ai Efu Essu Dyuerurīgu) is a professional Duel League in Yu-Gi-Oh! 5D's.
Yusei Fudo received an invitation to join the IFS Duel League. He was uncertain as to whether he would join or not, since he was also working on the Fortune mainframe in New Domino City.