Q.E.D., episode 2

Q.E.D. (Q.E.D.証明終了, 2009) is the story of two high school students: Touma, a boy genius who recently transferred from an American M.I.T. school, and Kana, the adventurous daughter of a detective, who team up to solve mysteries.

Suzuko, a woman Kana looks up to as an older sister figure, has written the schoolgirl to let her know she's getting married. Naturally, Kana goes over to visit as soon as possible, dragging Touma along for the ride. He soon loses his annoyance when he learns that Suzuko's mother is the famous doll maker, Katsumi Nanasawa, whose works easily fetch two million yen each. But the visit doesn't stay pleasant for long. They soon find that Yoshino, Suzuko's fiance, owes Kakuzou Akutsu, the director of a credit union, money, and the cold businessman won't relent in his harrassment until Katsumi gives one of her dolls to him. She refuses, proclaiming she would never give one of her dolls to someone who wouldn't love them. When Kazukou turns up dead some time later, shortly after Katsumi's own demise, it's up to Kana and Touma to find the killer in a list of three suspects.