She is a student at Kasuga's school.
Nakamura is a middle school student known for her quiet and creepy demeanor in the school, having no friends within her class. Having a demented outlook on life and bored of the mundane life in her town, she comes to see whom she believes is a kindred spirit in depravity with Takao Kasuga, when she witnesses him steal the gym clothes of his crush Nanako Saeki. Blackmailing the boy into a contract, Nakamura forces Takao into a series of situations to unleash his deviancy on Saeki. While at first hesitant to enact on these impulses, Takao eventually gives into Nakamura's warped mentality on living as the two get together to commit several depraved acts on their school and town.