Based on a game by Princess Soft.
Junna is an ordinal student of an elite school. However, surviving a gruesome traffic accident in the past deprives him of his parents and due to trauma he lost his memory.
Though looked after by his relatives, Junna lives alone with his twin sister Senna. The life with her, in the same high school, is so pleasant that he can almost forget the horrific past. However, he begins to recall the memories he lost in the accident.
What is the truth hidden in these memories?