Twilight Underground

Furukawa is a college student working part-time at a live music club. Surrounded by the music he loves and his friends, he enjoys himself every day. The only problem in his happy life is the manager, Kitayama-san! Kitayama-san has always been unsociable, but he is especially unfriendly towards Furukawa-kun. Even his fellow staff members tease him about their bad relationship. One day, Furukawa-kun, who is determined to make the manager regret how he treats him, ends up discovering Kitayama-san's secret...

(Source: Taiyo Tosho, translated)