Okay okay this is just a bullshit theory of mine but I think the point of the story is like this (Keep in mind I am shit at theories)
Maris is suppose to be the hero that would kill the demons lords when he grows up.(I mainly think this because they have the typical humans vs demon shit)
However...
@vox Just remember like I said this is a hentai doujinshi but the names is:
[ShindoL] a Nyuugyuu life | a dairy cow's life (Junai-Irregulars) [English] {5 a.m.}
[新堂エル] a 乳牛 life (純愛イレギュラーズ) [英訳]
You know the messed up part is that there is a hentai doujinshi that truns sexual but has of a more darker mood then this. Not bad tho the art is pretty good.