Referred to a Oono-senpai by Hina and Natsumi, she is the #2 at the breakwater club. Oono is by far the most reliable person at the club and almost acts like a mom to all of the members. She is the daughter of a fisherman so she is very knowledgeable about fish, cleaning and preparing them. She acts as the de-facto club chef.

She also is afraid of the water due to the fact that she cannot swim and wears a life jacket at all times. This doesn't deter her from fishing or enjoying the club. The President has said that Oono would make perfect wife someday, which makes her blush.