Oraku has a dream life. He teaches at a local high school, he's got his eye on a fellow teacher named Satsuki, and everything seems to be falling into place. Then Aya transfers into his class, and she's got a problem: her father is a ruthless yakuza boss who becomes convinced that Oraku is the only man trustworthy enough to watch over his precious daughter. So Aya moves into Oraku's apartment, and suddenly his comfortable existence becomes a minefield of temptation and terror. She's beautiful, she's relentless, and she's constantly finding ways to test his resolve while lounging around in various states of undress. The catch: her father has made it crystal clear that if Aya loses her innocence on Oraku's watch, he'll experience a slow and painful death. Now Oraku has to juggle protecting Aya from her own advances, warding off other interested parties at school, keeping his distance from Satsuki without raising suspicion, and trying not to think about anything remotely compromising. It's a comedy of escalating chaos where one wrong move could be his last.