Otome wa Boku ni Koishiteru Portable (2010)

This is PlayStation Portable version of the erotic visual novel of the same name.

Storyline

One day, the heir to the prosperous Kaburagi Corporation, a soft-spoken yet cultured young man, received a visit from his family lawyer. He came to pass on the final wish of the boy's late grandfather: that he attend an all-girls school! With his childhood friend Mariya - a talented fashionista - to help him with the "transition," Mizuho enrolls in his new school. It's not long before a series of strange misunderstandings leads to him being elected the school's "Elder Sister," the idol of the entire student body! It's one wild event after another at this all-girls charm school! Can Mizuho make it through the year with his identity - and his dignity - intact?