The down-and-out man Shigeo Omori (Subaru Shibuya) was released from prison, but was kidnapped by an unknown person on a street corner, and then beaten and passed out. When Shigeo woke up again, he seemed to have forgotten his name and past. He followed the singing to a nearby park, snatched the microphone from the lead singer of the band "Akainu" who was performing, screamed a song "Ancient Diary", and then fainted again. The band's manager, Kasumi (Fumi Nikaido), picked him up and took him home, naming him "Little Dot". She looked everywhere for the man's home, but found nothing. Because the lead singer was injured, Kasumi asked Little Dot to perform on stage. Little Dot's voice and charming performance excited the audience, and he seemed to have glimpsed the shadow of his dark past in the familiar melody of "Ancient Diary". His memory slowly recovered, and that was indeed a layer of his past that he was avoiding and unwilling to face...