Kotori Sakuma, an amnesiac actor who lost his memories in an accident, travels to Tokyo with his theater troupe for the premiere of a new production. The peaceful routine shatters when something he says is revealed to carry unknown power — and the hidden side of the world opens itself to him. Before he can investigate his forgotten past, the suspicious death of a friend drags him into a murder accusation. Set on the eve of Valentine's Day, 1921, Tokyo holds both the answers he needs and the conspiracy he did not ask to be part of.