熟れたカラダは僕専用 ～求め合うサドマゾヒズム～

Namino Yuuta enrolls into a school under his mother recommendation.
This school used to be an prestigious all-girls school, but because of the declining number of students, it had no choice but to go coed.

Yuuta thought there would be a few male students here and there but to his surprise, he is the only male in the whole school.
Not only that but the boy's dorm is all the way up a mountain behind the school. Yuuta a very shy kid feels uneasy and depressed about the future.