An exceptional marksman and hopeless playboy, private eye Ryo Saeba reluctantly forms an alliance with his late partner's sister to investigate his death.

Reiko, who has a knowledge of psychology, is worried about her best friend from college days, Keiichi, who has married Sumire, the daughter of a company president who has done her a great favor, without love. Meanwhile, Sumire has been posting a blog full of lies and pretending to be happy in her marriage...