Kinkoi: Golden Loveriche

Noble Private Academy.
An institution where future men and women of great wealth are cultivated.
It is a boarding school where students aren't merely educated, but also taught dignity.

This year, a sense of urgency hangs over the academy as a member of a royal family from a faraway Northern European country has been invited to attend.

In an unexpected turn, the princess takes a liking to our protagonist, Ichimatsu Ouro, and he is forced to attend Noble Academy alongside her.
That is when he ends up crammed into a vacant room in a nook of the women's dormitory...