Kisa works as an editor in the Emerald department alongside the reader. His perpetually youthful appearance means people constantly assume he's way younger than his actual age of 30. He's never had a serious relationship, which he attributes to a pretty straightforward problem: he tends to fall for guys based on looks alone without bothering to learn anything about who they actually are. It's a pattern he's aware of and not particularly proud of.
When he catches feelings for Kou, Kisa immediately gets in his own head about it. He's skeptical that anything real could come from it, knowing his track record. He's said something along the lines of "love at first sight works in manga, but real life doesn't work that way"—and he means it. The guy's genuinely convinced he's not built for actual relationships, so he doesn't let himself get his hopes up.
Content compiled by AnimeList.moe from publicly available sources.