Domestic na Kanojo

Natsuo Fujii is hopelessly in love with his teacher Hina, so an attempt to distract himself at a mixer ends with him spending a private night with a quiet girl named Rui. He assumes the encounter will remain a strange secret until his father announces a remarriage and introduces the daughters of his future wife: Hina and Rui.

Natsuo suddenly finds himself living under one roof with the woman he loves and the girl who shares a secret no one else knows. Hina is hiding a complicated relationship of her own, while Rui approaches her emotions in ways Natsuo never expects. Inside their new family, feelings that could once be ignored from a distance become daily choices, and the line between love and selfishness grows harder to recognize.