Having confirmed this one is unlicensed for sure, another link:
http://mangakakalot.com/manga/mairimashita_irumakun
I could seriously see this as a Disgaea game plotline, if not for the lack of Prinnies and other familiar monster types. One oft he characters is totally a Disgaea 1 style Majin, though, and the succubus-types are similar, though probably just from drawing on common inspiration. It's better than Disgaea 3's version of a Netherworld school if only in the lack of potty "humor" at least.
http://mangakakalot.com/manga/mairimashita_irumakun
I could seriously see this as a Disgaea game plotline, if not for the lack of Prinnies and other familiar monster types. One oft he characters is totally a Disgaea 1 style Majin, though, and the succubus-types are similar, though probably just from drawing on common inspiration. It's better than Disgaea 3's version of a Netherworld school if only in the lack of potty "humor" at least.