Eight years ago, Mochizuki Saya was raped and murdered by three juvenile delinquents. Protected under the Juvenile Act, the delinquents have been allowed to re-enter society... but Mochizuki Wakaru, Saya's younger brother, hasn't forgotten their crime and wishes for their punishment.... more>>

Not long after his sister's death anniversary, he decides to look for those responsible, however, he is run over with a bike by one of the delinquents and hospitalized. While at the hospital, he awakes the ability to interact with other people's dreams and discovers that these interactions bring real-life effects. Knowing that his ability allows him to do a "perfect crime," he vows to avenge his sister... when night falls. <<less