User blog comment:B214/Volume 23 discussion blog/@comment-81.135.250.239-20170404000834/@comment-10330822-20170405003759

I'm kind of surprised no one has realized he's living with them all. You think someone would notice they always come to school together and from the same direction and get curious.

Also, I feel Issei is at a point where these boys couldn't do crap to him even if they tried, and the girls are probably fighting inside deciding whether Issei is hot because of his physique or peverted. I ultimately don't think the harem will be mentioned officially for reasons Pawn pointed out, but I'm pretty sure if people find out he's "dating" these girls, hell is going to erupt.

Also, I don't expect these kids to have some strong opinion of polgomy anyway. Chances are the girls are just going to be disgusted and the boys will be jealous, its like any anime.