Today's top could be tomorrow's bottom when playing the caste game.

School is hard enough as it is, but when students are forced to play a cutthroat game to determine their social ranks--and subsequent treatment--all bets are off.

Karino's older half brother Tatsumi is a proper honor student, diligently and obediently following the path laid out for him by others. But after he unexpectedly falls for eccentric Senzaki, he takes a surprising detour by unscrupulously securing the delinquent caste for himself. Senzaki accepts Tatsumi's feelings with reckless abandon, expecting him to do the same. But is Tatsumi willing to forge a new path to be with the impetuous Senzaki?