Oraku has a dream life. He teaches at a nearby high school, and he hopes to one day wed Satsuki, a colleague on the staff. Then there is Aya, a pretty student who is in love with him, and her rich father, who wants her happy so much that he sends her to live with Oraku. So Aya moves into Oraku's apartment, and his easy existence becomes a minefield of temptation and terror. She is beautiful, and her favorite pastime is flirting with him while lazing around the place barely dressed. The catch: her father's money comes from his position as a powerful gangster, and if Aya does not stay completely pure, Oraku will be put to death slowly. Now he has to hold himself back, guard Aya from the crowds of men and women at school who desire her, and keep Satsuki and the other teachers from learning that a student lives with him, or his teaching career is over for good. The result is an ecchi romantic comedy where one wrong move could be his last.