The anime revolves around two protagonists, Hirono Hiro and Asou Renji. On Christmas Eve, Hirono Hiro meets a girl named Miyamura Miyako who was chasing a purse snatcher. Hiro later finds out that Miyako also goes to the same school as he does and they start hanging out together. This made Hiro's childhood friend, Shindou Kei, feel left out. Kei then tries to compete with Miyako for Hiro's affection and a love triangle ensues. The anime also tells the story of Asou Renji. Renji meets a girl named Shindou Chihiro at an abandoned train station. He soon learns that Chihiro suffers from a type of amnesia where her memory span only lasts for 13 hours. He also discovers Chihiro's dream of writing a novel, but she has never been able to fulfill that dream due to her condition. Renji then decides to help her fulfill that dream.