Having consolidated control over the school, Kouta is finally free to enjoy an afternoon with Nagisa. But just as the date seems to be going well, a new competitor appears! Yukiya Nishikawa, the heir to the rival group of the Higashiyamas, challenges Kouta to a contest between giants. In a game where lovers are pitted against each other and the loser forfeits a mistress, who will win out in the end…?!