Chisato Takatsukasa, a 35-year-old author, possesses such a youthful appearance that anyone would mistake him for being in his early twenties. His work draws inspiration from his idol—the best-selling mystery writer Saki Shunka, who remains as much of an enigma as the plots in her books. Chisato is also the extremely overprotective father of 15-year-old Riju, convinced that the "friends" his son constantly brings over are nothing but predators waiting for the perfect opportunity to defile his precious boy. Consequently, Chisato will stop at nothing to ensure they never visit again, resorting to the most extreme methods. However, there is no man he hates more than Riju's rather persistent best friend, Shunsuke Sakaki, who simply refuses to go away regardless of Chisato's efforts. Yet, the motivations of these characters remain secrets bubbling just below the surface. Why is Chisato so wary of Riju's friends, and what exactly does Shunsuke know about the mysterious author his friend's father idolizes?