Monaka Sengoku, the bitch sister who distorts the friendship and sexuality of her otaku brother
An otaku male college student who started living on his own after going to college. Envying her brother, the younger sister began to frequently go in and out of his room. One day, the younger sister negotiates to rent her older brother's room as a place to have sex with her sex friend, but he refuses because a friend is coming over. The troubled sister decides to carry out a diabolical idea that suddenly comes to her mind... A habit called Sado that he discovered while pushing his own brother mentally. He laughs at his older brother, who has had their friendship destroyed and turned into a masochist.
