Kentarou Oohama (大浜 謙太郎 Ōhama Kentarō), nicknamed Kenta (謙太), is a friend of Naru Kotoishi.
Kentarou has short, buzzcut grey hair, black dots for eyes and a strange scar at the bottom of his right eye.
He commonly wears a blue and white striped tank top and light brown shorts.
Just like Naru Kotoishi, Kentarou is a a really energetic kid and the first time he met Seishuu Handa he gave him a butt jab. He appears to have a crush on Naru since in episode 3 he was jealous when Naru paid more attention to Seishuu than him. Kentarou is quite interested in bugs and insects.
Kentarou appears in the last few minutes of the first episode where he gives Seishuu Handa a butt jab when the village volunteered to help him move into is new house. He is seen again in episode 3 where he people await mochi-picking from the boat, yet after being ignored by Naru Kotoishi he picked a batch of mochi, but trips and drops the mochi into the sea. Iwao Yamamura gets angry and punches Kentarou on the head.
- The name Kentarou means "humility, self-effacing, humble oneself, condescend, be modest" (謙) (ken), "thick, big" (太) (ta) and "son" (郎) (rou).
- Kentarou's surname Oohama means "big, great" (大) (o) and "beach, seashore" (浜) (hama).