I want the whole world to be happy, and it doesn't matter if I bear all the pain for this!
The 15-year-old girl Yurun Wu picked up a mysterious file called the death notice of the school student union president Chigusa Sakurako during one day's recess. It recorded a series of internal affairs and the cause of death of Chigusa, which shocked Mai. Before Mai realizes her determination to save Chigusa, a man who claims to be a god appears and is willing to make a contract with Mai to help Mai achieve her wish. But then, from this man's mouth, Mai learns an even more shocking fact~