The Yakuza Boss once led the criminal syndicate tied to Yotaro’s past. After Yotaro’s prison release, the boss makes efforts to draw him back into underworld dealings but abandons the pursuit upon observing Yotaro’s unwavering commitment to rakugo and the acclaim of his debut performance. This pivotal encounter culminates in the boss silently conceding to Yotaro’s reformed life, formally dissolving their former alliance.

A shadow of their shared history lingers through unverified speculation that the boss fathered Konatsu’s son, Shinnosuke—a theory Yotaro posits due to Konatsu’s secrecy. Competing hypotheses, including Higuchi’s alternative suggestions, leave Shinnosuke’s parentage ambiguous. The boss’s legacy resurfaces when whispers of Yotaro’s yakuza ties and concealed tattoos jeopardize his standing in rakugo, underscoring society’s enduring prejudice against tainted histories.

Visually embodying classic yakuza motifs, the boss sports a hardened expression, facial hair, and sunglasses. His narrative function anchors Yotaro’s transformation from criminality to artistry, emphasizing the struggle to shed a stigmatized past within a rigid traditional sphere.