Maruki is a retired concierge who occasionally returns to work temporary jobs at the Hokkyoku Department Store. He is a supporting character in the story, serving as an experienced but somewhat outdated figure among the staff. In appearance, he is a full-bodied man with somewhat long hair, a moustache, and a beard. His look lends itself to a later role as Santa Claus in a seasonal chapter.

His personality is marked by charm and showmanship. He is very popular with female patrons and known for performing magic tricks, which he uses to entertain guests and create a pleasant atmosphere. He is deeply knowledgeable about the department store and customer service, drawing on many years of experience. However, because he worked so long ago, much of his knowledge is tied to businesses that have already shut down, leaving him with a mix of practical wisdom and outdated information.

Maruki's motivations stem from a continued dedication to his former profession. Though retired, he willingly answers calls to help out, suggesting a strong sense of duty and affection for the work and the store. His role in the story is that of a seasoned former concierge who offers assistance when needed, providing a contrast to the newer staff and their more contemporary approaches. He does not undergo significant development within the narrative, instead remaining a consistent representation of the old guard. His key relationships are with the current concierge staff, whom he supports in a temporary capacity, and with the female customers who are drawn to his warm and entertaining manner. His notable abilities include his extensive but aging knowledge of services and establishments, his skill with magic tricks, and his experienced handling of guest interactions.