Kenzo lives in the village destined for submersion beneath the Hotarugaoka Dam.
He immediately befriends Yuta after Yuta's accidental time displacement to 1977, forming a close bond alongside Saeko.
Kenzo anchors Yuta in daily village life, sharing activities like swimming, preparing for the final summer festival, and observing firefly gatherings.

This friendship makes Kenzo Yuta's primary confidant during the final month before the village's abandonment.
He lives with his grandmother, who also provides temporary shelter for Yuta.
Kenzo's experiences reflect the village's impending loss, portraying industrialization's impact through his perspective.

Following Yuta's return to his original timeline, Kenzo reappears as an adult during the film's conclusion.
Adult Yuta revisits the dam area and encounters former villagers, including Kenzo.
This reunion confirms Kenzo survived the village's dissolution and retains clear memories of Yuta's visit despite the time displacement.