Kasuga Serina is a cheerful girl and enjoys her school life. One day, she meets a handsome transfer student, Yukimura Yukinojo, who acts as if he were indifferent of others. Despite his behavior, she cannot help caring about him.

Takayasu Higashino is private detective with plenty of expert skills above and beyond mundane investigations. His knowledge of guns is second to none, his martial arts skills are world-class, and his special interrogation techniques are guaranteed to elicit a confession from any female suspect. When Takayasu rescues the beautiful Ayane from a rape, he is drawn into a dangerous game of intrigue and seduction. He goes under cover and under the covers to sneak into Ayane's mansion, where she has been imprisoned by her family's sex-crazed bodyguards. Before reaching her, however, Takayasu must not only out-smart Ayane's devilish uncle and his gang of servants, but also her seductive aunt, Kiyoe. This 'house-mistress' definitely has her own plans to distract the heroic detective, and it will take all of his special skills to turn the tables on her.