Ginnosuke Tadokoro is a sixth-year elementary school student living at the Asagaya Apartments. He spends time with fourth-year student Yuma Sawatari and his classmate Shingo Kishi; both affectionately call him "Gin-kun." As the oldest in the group, Ginnosuke naturally takes on an older-brother role, frequently playing games and engaging in activities with the younger boys. He maintains a calm presence yet excels academically, balancing his social life and studies. Ginnosuke possesses a rational nature, consistently making logical and measured decisions when resolving challenges or conflicts among his peers. This approach positions him as a peacemaker, actively seeking harmony and practical solutions. The loss of his father significantly shapes his outlook, instilling a sincere desire to help people facing adversity, a compassionate drive that guides his interactions and choices.