The main protagonist's childhood friend and underclassman by one year.
She has a crush on him.
She always cared for him, and though she has such a small body that did not grow that much after three years, she is a very skilled cooker and earned some respect back then.
She is a little complexed by her height and growth, wishing that Makoto would stop treating her as a child but more as a potential woman.
Also, she speaks with a gentle Osaka accent, and lived there when she was a child.