Tetsuo Tosu is a typical father whose biggest worries are his job and his rebellious daughter, Reika. That is, until he finds a bruise on her face. His worst fears come true when he finds out she has a secret boyfriend...and he's part of a crime ring that's using her to steal her grandparent's wealth. If that wasn't bad enough, the thug catches Tetsuo snooping around and threatens to kill Reika as soon as she gets home. Fueled by fatherly instincts, Tetsuo murders the man...only for his wife to walk in and witness what he's done. Now with a corpse to hide and a crime ring hot on his tail, Tetsuo must resort to his love of detective novels and his wits to stay one step ahead of a grim fate...
Year 2018, Chiba Prefecture, Japan. Momoya works as a teacher at grade school. He lives with his wife, who was a childhood sweetheart, and his son, Ao. Ao has just come back from his long days in a hospital. They are a happy family, living in a house they built for themselves. Momoya loves his life, peaceful days...but one day, he starts to receive strange postcards. Each postcard tells Momoya of what happens in the future...and from the second postcard, the sender asks Momoya to save someone. Momoya can't ignore the message and runs to the place written on the postcard. It really happens...are the postcards sent from future? He doesn't know who the sender is...and what the sender wants. Momoya must face the "past" to protect his family.
"I think I want to break up..." - The night she had that thought, he appeared as a ghost.She thought it was a bad joke, but the next day, he was at university, acting like nothing had happened. From that moment on, her peaceful life began to quietly unravel. This is the beginning of a strange and beautiful everyday life, caught between the him who is alive and the him who is dead.