Ayumi Shinozaki is 33-years-old and works as a librarian. Keisuke Mori is 23-years-old. He wanted to become a cameraman, but had to give up on that goal. Taro Tendo is 40-years-old and divorced. He holds regrets about his son.

One day, Ayumi Shinozaki receives a phone call. A man's voice states "one hour later, an earthquake will occur." One hour later, an earthquake actually takes place. The caller introduces himself to Ayumi Shinozaki as Kazama. He tells her she can go back in time to 10 months ago and change what she wishes. 8 people including Ayumi Shinozaki, Keisuke Mori and Taro Tendo participate, but they face something they did not expect. Under the difficult situation, Ayumi Shinozaki and Keisuke Mori develop feelings for each other.