Koichi Mizuki is one of the main protagonists of The Titan's Bride series, alongside Caius. He's a high school senior who just graduated from Touou High, where he was kind of a big deal—captain of the Basketball Club for three years straight and consistently a top student. The girls at school were definitely into him; his height, athletic build, and good looks made him one of those effortlessly popular guys you see in anime.
Content compiled by AnimeList.moe from publicly available sources.
