This is by the same mangaka as Prison School. It’s an interesting manga, even if it isn’t nearly as sexy, and even a bit weirder. (Now updated to include all 32 volumes).
Wow. We finally get to see Chisato’s tits. And ass. And we get to see all kinds of fun stuff happen to both. However brief it was, the inclusion of the titfuck scene is a fortuitous sign.