Domestic Girlfriend

Natsuo Fujii is hopelessly attracted to his teacher, Hina Tachibana, despite believing a relationship with her is impossible. At a party arranged by his friends, he instead meets Rui, and the two have a brief intimate encounter they assume will never have lasting consequences.

That assumption collapses when Natsuo's father announces his remarriage. Natsuo learns that his two new stepsisters are Hina and Rui Tachibana, placing both women directly inside his new family life. Domestic Girlfriend builds its drama around that sudden household arrangement and the romantic complications Natsuo can no longer simply leave behind.