Maika Houdzuki is a high school student who is never truly alone as she shares her life with her deceased twin brother, Maito. They take turns living each day and have similar memories, but can only communicate when asleep and sharing the same dream. Maika's supernatural existence allows her to see ghosts. In the first volume, the school counselor enlists Maika/Maito's help in uncovering the truth behind a missing female student whose ghost left a message scratched into their classmate. The twins are sure to encounter more mysterious events in the future.