Hassaku Hozumi works as a staff member at Studio Petit, collaborating with Mikiko "Kuromi" Oguro to oversee animation production. His responsibilities include offering pragmatic strategies to manage the studio’s unconventional animators, often relying on psychological tactics to optimize their efficiency. During the first installment, he advises deliberately provoking Aoi Fukami—a discontented housewife and animator—by referencing traditional gender roles, a method that unintentionally accelerates her output by channeling her frustration into productivity.

In the sequel, he continues supporting the studio as it balances escalating workloads and tight deadlines. Though less directly involved in the primary tension between maintaining quality and meeting schedules, his steady presence emphasizes his integral role in sustaining operations amid the studio’s evolving challenges. The narrative confines his portrayal to these professional interactions, without elaboration on his personal history or motivations.