In a world where demi-human races are facing declining birth rates due to a lack of males, the government introduces an Assisted Mating program. Humans are randomly selected to help demi-humans conceive by having sex with them. Elven Princess Iris Thea Eaderlindt, known for her friendly attitude toward humans, is transferred to Ark Metropolitan Academy as a goodwill ambassador. Coincidentally, her new homeroom teacher is chosen as her mating partner. Anxious but determined to secure the future of her race, Iris begins sexual activities with her teacher. To her surprise, she discovers that her teacher's ancestors were orcs, famous for their extraordinary sexual prowess. The episode focuses on their first intense encounters including deepthroat, paizuri, raw sex, and creampie as Iris starts to enjoy the process