A boy named Yugi Mutou solves the Millennium Puzzle which turns in into the "King of Games".

The popularity of Digital Pets leads to a contest, and Honda trains Miho's pet, so they can take the paid trip. Meanwhile, Yugi is worried for his friend Haiyama, who seems to be pressured into some shady business by the bullying Kujirada. But all is not what it seems...

Anzu clashes with the beautiful but sadistically strict Ms. Chrono, and organizes a petition to change the school rules. But Chrono's underhanded counterattack ruins the petition--until Dark Yugi steps in.

With Honda seemingly dead, an enraged Dark Yugi battles Mokuba, Kaiba's little brother, in Capsule Monster Chess.