Rin x Sen + Ran - Sem Cross Mix - Season 1

Urara continues to endure mistreatment at the Kurodou institute. The headmaster informs her that her fiancé, who burdened her with an immense debt payable only with her body, has been spotted at the Believe laboratory. Two lecturers there, the Ichinose sisters Riko and Anna, introduce Urara to the lab's master, Majima. He receives her in an opulently garish room, unable to conceal his lecherous gaze. Majima declares that she has been chosen by a divine power and must join a seminar to find answers. This seminar, however, is merely a pretext for daily, unrestricted sexual activities, with Urara as a central figure. Later, Riko reveals a shocking truth to Urara: her fiancé's real name is Kaji, and he is a lecturer at the Believe Lab. Additionally, Urara's senior, Asuka, is also involved with the lab. Riko describes, with a provocative smile, sexual encounters between Kaji and Asuka, stirring jealousy in Urara. Urara then enters a playroom and witnesses Kaji and Asuka engaged in intercourse. Overwhelmed by surprise and despair, she stumbles backward against a wall. Finally breaking, Urara utters the word "Be... lie... ve..." with a mysterious smile.