The Raijin Stable Master owns and leads Raijin Stable, the sumo training facility where Matsutarō Sakaguchi starts his career. He personally recruits Sakaguchi after seeing the young man's raw strength in an impromptu brawl with a professional wrestler, spotting potential despite Sakaguchi's disruptive and self-centered nature.

He manages Sakaguchi's chaotic presence pragmatically, using strategic methods like assigning tasks or creating diversions to prevent conflicts. This includes organizing an outing with Reiko Minami to stop Sakaguchi from demanding an elaborate victory parade after a major win. Alongside his wife, he shares visible concern over Sakaguchi's antics, employing tactics such as headache patches or feigning distress to handle tense moments.

Despite the challenges, he recognizes an unexpected benefit from Sakaguchi's presence. He observes that the other wrestlers, including the higher-ranked Inokawa, have become physically and mentally tougher due to the relentless, unpredictable atmosphere Sakaguchi creates. This reflects his ability to identify value in unconventional circumstances.