Tatsuhiro Satou

Age: 22 Height: 176 cm (5'8") Weight: 58 kg The story's protagonist is a 22-year-old hikikomori and NEET of nearly four years. He is highly unstable, easily manipulated, obsessive, and often blames the N.H.K. conspiracy, a fabrication of his mind, for his shortcomings. He lives in a rented apartment, but depends on his parents' allowance to live.

At the end of the novel,Satou and Misaki promised each other to get married once they finish school.