A boy who suffers from impaired hearing and a young girl pianist try to solve the mysterious connection between a series of murders and the boy's entangled memories.
Meet Chika. She thinks she's been jinxed: she's going to be dumped on Christmas Eve. Enter Tomako, who likes reading and making pudding. Although they're total opposites, by a twist of fate, they become best friends. However, it turns out they both want to spend Christmas Eve with the same guy. Will they choose friendship? Or love?
On a long-distance bus to Aomori, Sato, on the run after avenging his dead daughter, meets Pastel, a girl travelling to claim her grandfather's biplane, and the two exchange idle conversation. When a detective suddenly boards the bus, Pastel panics and pulls out Sato's gun.