Sakujirō is the manager and owner of the Shunra-tei yose theater, overseeing its daily operations and coordinating rakugo performances. His responsibilities include organizing events, such as informing performers Bunko and Mameda about opportunities like the rakugo rookie competition sponsored by Teikoku Paper.

He possesses green hair and black eyes, though some sources describe his hair as black. His typical attire consists of thick round glasses, a long-sleeved white button-up shirt, a blue haori, black pants, and brown shoes.

Sakujirō's personality blends a deep sense of responsibility for the theater and its performers with significant introversion. Despite his quiet nature and lack of physical strength, he steps up to courageously defend friends or the theater's interests during confrontations. Colleagues, particularly Omatsu, frequently correct or direct him, highlighting their close working relationship.

His background identifies him as the younger brother of Sakutarō Yotsuya, president of the Teito Corporation. This family tie sometimes connects to theater activities, like Teikoku Paper's sponsorship of the rookie competition. The timeline of his acquisition of the yose theater remains unspecified.

He maintains positive professional relationships: holding Bunko in high regard, sharing a friendly rapport with Mameda, and collaborating closely with Omatsu despite her assertive guidance. As manager, he provides steadfast support for the main cast, facilitating their artistic journeys through logistical coordination and advocacy.