Kaito Jin is a high school student who transferred from Tokyo to Nagoya in Aichi Prefecture, entering his second year at Tagane High School. Born October 1st, he possesses dark blue hair and blue eyes. His arrival in Nagoya is marked by unfamiliarity and a Tokyoite's sense of superiority, leading him to view the region as culturally inferior. This attitude surfaces through his frequent corrections of Nagoya dialect and customs, particularly during confusing and frustrating early interactions with classmates like first-year Monaka Yatogame.

His integration begins when he joins the school's photography club. This club becomes the main setting for his exposure to local culture, as he documents Nagoya's landmarks and everyday scenes at places like Nagoya Station and the Osu shopping district. These experiences deepen his understanding of regional distinctions. While his initial habit of correcting non-standard speech and customs is pronounced, it lessens as familiarity grows.

Relationships within the photography club shape his adaptation. Monaka Yatogame, a Nagoya native, becomes central to his cultural education; despite initial clashes over her blunt dialect and local pride, their exchanges foster mutual respect. Fellow club member Mai Tadakusa, from Gifu Prefecture, offers additional regional perspectives. Club president Yanna Sasatsu, from Mie Prefecture, contributes her own dialect and relaxed approach to responsibilities. These interactions collectively challenge his Tokyo-centric worldview.

Having no prior connection to Nagoya, all aspects of Aichi life are new to him. Local foods, including miso-based dishes, and traditions become points of observation and occasional participation. The club's focus on documenting Nagoya's environment facilitates this exploration, turning photography assignments into opportunities for comparing Tokyo and Nagoya customs. His development reflects a shift from dismissiveness to engagement, though he retains his identity as an outsider learning regional nuances.

Throughout the series, his role encompasses typical school activities and minor club responsibilities alongside cultural adjustment. The narrative emphasizes his school life and peer relationships, leaving his family background largely unexplored. With significant personal conflicts limited to cultural misunderstandings, he functions primarily as an observer whose growth is measured in incremental acceptance rather than dramatic transformation.