Rock is a 70-year-old male Leo, born July 26, who owns and operates the coffee shop "Rock" on the first floor of the building housing Monthly Moso Science magazine's editorial offices. His café serves as a frequent gathering spot for magazine staffers Taro, Jiro, and Saburo during their workdays. Functioning as a hub for animation and manga enthusiasts, Rock leverages his extensive knowledge to engage patrons with tailored recommendations and insights, fostering an environment steeped in animated culture. Beyond business, he acts as parental guardian to Jiro Tanaka and provides care for Saburo, Jiro’s afghan hound. The café’s proximity to the magazine offices facilitates regular interactions with the main characters during their investigations and daily routines.