A hentai visual novel.

Story summary from https://vndb.org/v12982 : 

"It was an odd time for Yuu to transfer to Niiyatomori Gakuen. Other than being able to fall fast asleep anywhere, he’s a pretty normal guy. Within half a month, he had made three friends. Shuugetsu is smart, handsome and a model student… if he could just keep his mouth shut. Shuugetsu’s osananajimi Kamui is an active girl who looks like a cool beauty… except she turns awfully delusional at the sight of anything cute. The long black-haired student council president Konoha is perfect in every way… until at important moments when extreme nervousness takes over.

The four of them are the only members of a dormitory within the school premises, which will be closed down for reasons relating to the declining birthrate. One day, a new transfer student and dorm mate arrived. The blond-haired Alexandra and her maid Ingot said they came to Japan to study meteorology, but she has a secret. Then one day, they found a child left behind in front of the dormitory."
aka-san to kyuuketsuki