Which is the real me?The 18 years old heroine, Hinata Yuuki, lost her memories in an accident. Despite this, she lives an energetic life, until one day, strange things start happening to her: a diary that doesn't belong to her, a handsome guy who she has never met before suddenly talks to her, and an abnormal constitution that makes her fall asleep at a certain time.The mystery deepens, and love begins. This is a romance x mystery unlike no other!