Tsuji is isekaied into the world of hair, where being hairless is not only freakish and unnatural, but inappropriate! He's taken in by Prince Falu who helps him adjust to this world and takes care of him, even beginning to get physically intimate, but when Tsuji realizes that Falu sees him as little more than an exotic means of relieving his frustration, he runs away and ends up back in his world. But once they're separated, he realizes how much Falu meant to him and has to find a way back. I think the way this world and culture are imagined is very interesting. Trigger warning: dubcon.
Itoshi no Kemukujara