In rural Japan, the survivors of a tragedy converge and attempt to overcome their damaged selves, all while a serial killer is on the loose.
High school student Yuki Hase wants to become close with classmate Kaori Fujimiya who is alway by herself. Kaori Fujimiya refuses to become close with Yuki Hase, because she forgets her friends every new Monday. Even though Kaori tells Yuki why she doesn't want to become friends, Yuki still wants to become close to her.
Based on the comic by Mako Takami.
