From the artist comment:
"As a side note, the conditions of the app are "You must not use it on people to make them die" and "You must not use it for anything unrelated to childmaking.
If you break these...😱"

Well there's the explanation for why he needs high school girls as cash cows. I assume the artist got asked the same questions about that topic lol.

Raw: https://e-hentai.org/g/2270655/b88a95c7f0/
Source: https://serei.fanbox.cc/posts/3419844

Artist Links:
https://serei.fanbox.cc
https://www.pixiv.net/en/users/2622915
https://twitter.com/t_serei

>"naggy"

Base +6, vertical climbing +4, Dasu -7

So he has a sister huh

Base +6, that4znkid +7, Keksz +6