Kantoku serves as the shift manager at the manga bookstore Umanohone, a role that defines his daily interactions and responsibilities within the series. His nickname, which means director, originates from his habit of recording his coworkers with a video camera, an activity that reflects his eccentric interests. He is a young man of average height who presents himself as a capable and often serious leader, but this professional demeanor frequently clashes with his personal quirks.

In terms of personality, Kantoku is a complex figure who embodies a dual nature. On one hand, he is a hardworking and efficient manager who takes his duties seriously, ensuring that the store runs smoothly, organizing events, and managing his team effectively. He can appear strict, lazy, or even despotic at times, but this is largely a surface-level attitude that masks his underlying competence and good nature. On the other hand, he possesses a pronounced and often crude sense of humor, particularly enjoying making inappropriate jokes at the expense of his female colleagues. His most notable personal trait is a strong fetish for women's underwear and breasts, which, combined with his love for recording people, contributes to the more adult-oriented comic relief of the story. Despite these perverted tendencies, he is not portrayed as malicious. His relationship with the other employees shows that he genuinely cares for the well-being of his team, even if his methods of expressing it are unusual or teasing. He also has a notable interest in yaoi, which is suggested to be driven more by its profitability and popularity in the market rather than personal preference, highlighting his business-minded approach to the otaku merchandise surrounding him.

Kantokus primary motivation is ensuring the success of the store and managing his chaotic group of employees. He frequently devises new promotional campaigns and pushes his staff to participate in promotional events, sometimes with absurd or embarrassing results. He is also driven by an unspoken and often poorly acted-upon romantic interest in his coworker Hiotan. This romantic subplot is a key part of his character development, as the two clearly share mutual feelings but are both too awkward or stubborn to properly act on them, leading to a series of comedic and frustrating near-misses. His maturity is most evident in his interactions with Hiotan, where beneath his teasing jokes, he shows moments of genuine care and consideration for her, revealing a more thoughtful and adult side to his personality.

His key relationships are primarily with his subordinates at the store. He frequently clashes with the energetic and mischievous Hiotan, though this tension is rooted in their mutual attraction. He also teases the shy and insecure Sensei, often commenting on her lack of femininity, and he interacts with the quiet and knowledgeable Sommelier and the zombie-obsessed Fu Girl as part of his management duties. His position at the store and his personal quirks make him the central figure orchestrating much of the chaos, while his recording hobby serves as a recurring gag and a defining character quirk. Despite his many flaws, Kantoku remains a fundamentally competent and reliable leader. He proves to be a surprisingly mature and dependable person when a serious situation arises, even if he spends most of his time living up to his less flattering reputation as a perverted director. His notable abilities include his managerial skills, his knowledge of the manga market, and his talent for capturing his coworkers in embarrassing situations with his camera.