18+ Momiji (OVA)

Story begins as Momiji's chastity is taken by Kazuto. We learn that Momiji is a girl without a will of her own, while Kazuto is the son of a wealthy and influential family. Kazuto took an interest in Momiji when he saw her at school, and he went out of his way to get her to come live in his house as a maid.

(Source: ANN)