Kenta inhabits a remote mountainous village in Japan's Kōchi Prefecture during World War II. His community holds widespread negative perceptions of Americans and British people, often labeling them "brutes," fueled by war casualties affecting villagers' families.

The arrival of Eiko, a new elementary school transfer student from Yokohama who possesses blue eyes inherited from her American father, disrupts the village. While other children and teachers engage in or condone her mistreatment due to her appearance, Kenta regards her primarily with curiosity rather than hostility or disdain. This initial reaction distinguishes him as the sole classmate who refrains from participating in or endorsing the bullying directed at her.

A significant shift occurs when the injured father of one of Kenta's classmates returns from the battlefield. This event, coupled with further news of war casualties, resonates deeply among the children, including Kenta. Witnessing the war's direct consequences on someone he knows, alongside Eiko's ongoing victimization, prompts Kenta to reassess the entrenched prejudices surrounding him. His perspective gradually evolves from passive curiosity toward a more conscious rejection of the hostility aimed at Eiko, influenced by the tangible suffering brought by the conflict.

No additional background, development, or appearances of Kenta in other official media such as seasons, movies, OVAs, or spin-offs are documented.