Kouki is a model best known for his secret life as an otaku—a detail that catches most people off guard given his pretty-boy image. Kirino initially roped him into being her fake boyfriend as a way to make Kyousuke jealous and understand what she felt when he spent time with other girls. The plan worked well enough that Kouki and Kyousuke eventually became genuine friends, with Kouki offering dating advice and help more than once.
That said, Kouki has his moments of causing chaos. He once gave Kyousuke an expensive set of adult game figures as a housewarming gift—the kind of thoughtful-but-awkward gesture that only makes sense when you know he's an otaku too.
Content compiled by AnimeList.moe from publicly available sources.
