Ousama Game The Animation

Synopsis

High-school student Kanazawa Nobuaki transfers into a new school and tries to distance himself from his new classmates. At midnight Nobuaki receives a text from someone called the King outlining the rules of The Kings Game. Every student must participate and follow the instructions or face death. Nobuaki is ordered to kiss Honda Natsuko. Every student in class, who all received the text, think Nobuaki is joking. Nobuaki tries to explain the game is real, making most of them angry at him. Nobuaki, who has played the game before, decides to break the rules and die, meaning Natsuko will also die. As the 24 hour deadline approaches Nobuaki waits to die only for Natsuko to appear, confess her love and kiss him with seconds to spare. Nobuaki realises several people from class had received different instructions and rushes to find the other students with instructions. He is too late as he finds several of them have hanged themselves in their bedrooms. The surviving students, realising the game is real, accuse Nobuaki of being the murderer. One of the students, Satou Yuuichi, receives a punishment text for breaking a rule and immediately bleeds to death.

(Source: Wikipedia)