BAGR-034 Mai Arisu, 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. Her sister, who was jealous of such a man, began to frequently come in and out of her brother's room. Her sister negotiates with her boyfriend to rent her room as a place to have sex, but he refuses because her friend is coming. Her troubled sister suddenly comes up with her diabolical idea and decides to carry it out... Sade awakens while pushing her own brother mentally.