Yuya Masaoka is a blonde, blue-eyed high school student with neck-length hair who attends a preparatory school, defying expectations set by his flashy appearance. Peers commonly call him "Yūya," and he counts Natsuo Fujii as a friend. Exhibiting a playboy personality, he maintains a girlfriend while engaging in problematic habits with women and favoring group dates. His history includes a past physical relationship with classmate Momo Kashiwabara. Post-high school, his role in the narrative dwindles until he is written out.