Boku Dake no Hentai Kanojo Motto The Animation

Takigawa Hina attends a well-known all-girls academy and is in a relationship with the narrator. Both individuals share similar unconventional interests, creating a strong mutual understanding. However, the narrator notes one specific act Hina consistently refuses to perform. He expresses a desire to witness her urinate, specifically in his presence and for his viewing alone. To advance their relationship further, he resolves to undertake this personal challenge.