Three short stories in Tokyo about people's death and how they see their life after death. In each story the main character experience death and they live another life that seems just like another day. Regretting their ignorance that caused pain to their beloved ones, each tries to find a clue to what went wrong in another life.

Mizuki, who has been assigned to a new high school along with her younger sister, has encountered numerous strange phenomena since their arrival. What could be the cause? The veteran teachers, who have worked there for years, begin to grow fearful. It seems that it may be related to an incident from 13 years ago. Can Mizuki and her group prevent the next murder before it happens? And what is the true objective of Mizuki’s sister, Anna?