In Episode 1 of "Boku ni Harem Sexfriend ga Dekita Riyuu," the protagonist, Kaito, finds himself in an unexpected situation where multiple female acquaintances express a desire to become his intimate partners. The episode explores the dynamics of these new relationships, focusing on the interactions between Kaito and each woman. As the story unfolds, viewers are introduced to the backgrounds and motivations of the female characters, shedding light on why they are drawn to Kaito.