Mitsuki is a beautiful female student who everyone envies, with excellent grades and a good personality. Torii, a middle-aged man living nearby who has a crush on her, is a former writer and unemployed man who is living a life of despair. One day (a few years ago), Mitsuki moves into the neighborhood. Torii, who is in love with Mitsuki despite his age, is drawn to her beautiful appearance and demeanor, and makes it his life's work to watch over Mitsuki's daily life from the shadows. However, the more he gets to know her, the more he realizes that her daily life is immoral, lewd, and gruesome...