The school is a breeding ground of jealousy, envy, and lust as it is governed by the merciless caste system. Students' standings in class are determined by the Caste Game, a game where each student draws a poker card. Once the reigning "king," Azusa fell victim to Karino's treachery, who he believed was on his side. As a result, Azusa is now a "target," while Karino claims the throne as the new king.