第1話: 学校での勉強会中に武と美智が白黒カードゲームに出会う。

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Takeshi and Michi stay overnight at their school to study, where Takeshi picks up a card and Michi tells him that it comes from a game called Weiß Schwarz and that she has won many tournaments involving that game. Michi ends up getting sucked into a portal. (Source: Wikipedia)