Junichi Katsuragi 桂木淳一

Sentaro idolized Junichi, whom he affectionately calls "Brother Jun". In fact, the friendship between Junichi, Sentaro, and Ritsuko goes way back to when they were kids. "Brother Jun" goes to college in Tokyo now, but whenever he comes home, he always stops in at Welcome Records and jams on the trumpet, playing jazz with Sentaro and whoever else is around.