Osanai Kei enjoys a peaceful and happy life with his wife Osanai Kozue and daughter Osanai Ruri, but his wife and daughter die in an accident. Osanai Kei's life suddenly changes. One day, a man named Misumi Akihiko visits Osanai Kei. Misumi Akihiko tells him that on the day Osanai Kozue and Osanai Ruri died, Osanai…