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Genius mathematician and high school teacher Ishigami Tetsuya has taken a fancy to Hanaoka Yasuko, a lady working at a bento store. He learns that Yasuko and her daughter have killed a person and helps the two of them to construct the perfect alibi. The police investigation runs into difficulty and detective Kusanagi Shunpei seeks the advice of his friend, the brilliant physicist Yukawa Manabu. Ishigami is Yukawa's college friend. A fierce battle breaks out between the genius mathematician and genius physicist. (forgalmazó hivatalos szövege)