Ruled by the cruel ranking system, the school is a swirl pool of jealousy, envy and lust.

Caste Game, a game that determines every student's ranking in the class by the poker card each one found. Azusa used to be the top of the caste, the "king," but he was deceived by Karino, who Azusa thought was loyal to him. Azusa became a "target," while Karino becomes the new king.