Hiroshi Ōtawara, proprietor of Rinne—a shop specializing in traditional Japanese instruments—crosses paths with the Tsugaru shamisen club after repairing Seiryu Kamiki’s instrument, leading him to tutor its members. His expertise proves pivotal in guiding their musical growth, as he offers technical insight and practical support. With facial hair and glasses framing his features, his appearance reflects a mature, composed demeanor befitting his role as a seasoned mentor.