Domestic na Kanojo

Natsuo Fujii has romantic feelings for his teacher, Hina. In an attempt to move on from these feelings, Natsuo attends a mixer with his classmates and meets a peculiar girl named Rui Tachibana. Unexpectedly, Rui asks Natsuo to accompany her and do her a favor. To his surprise, they end up at Rui’s house where she asks him to have sex with her. However, there is no love involved in this request, as Rui simply wants to learn from the experience. Natsuo reluctantly agrees, thinking it may help him forget about Hina. This unusual encounter leads to a new problem for Natsuo when his father remarries and he gains two stepsisters, who happen to be Hina and Rui. Now living with both the teacher he loves and the girl he had his first sexual experience with, Natsuo finds himself in an unexpected love triangle as he navigates his way towards adulthood.