3D Kanojo: Real Girl

Hikari Tsutsui is socially isolated, with little interest in anything beyond anime and games. His only close companion is another otaku. As punishment, he is assigned to clean the school pool with Iroha Igarashi, a student known for her rebellious and promiscuous reputation. Iroha is disliked by many female classmates but admired by male students. She unexpectedly expresses interest in Hikari and suggests they start a relationship, which he accepts. However, Iroha plans to move away in six months, meaning their relationship has a limited timeframe.