Genius mathematician and high school teacher Tetsuya Ishigami (Shinichi Tsutsumi) has taken a fancy towards Hanaoka Yasuko, a lady working at a bento store. When he learns that Yasuko and her daughter have killed a person, he then helps the two of them to construct the perfect alibi. The police investigation runs into difficulty and Detective Kaoru Utsumi (Kou Shibasaki) seeks the advice of his friend, the brilliant physicist Manabu Yukawa (Masaharu Fukuyama). Ishigami is Yukawa's college friend. A fierce battle breaks out between the genius mathematician and genius physicist.
