Shizu

A very timid girl from Osaka, where Fuka used to live. She becomes Takaishi's girlfriend, and comes along with a group of Fuka's friends to visit Tokyo. She tearfully begs Fuka to not take Takaishi from her, as she knows that Takaishi truly loves Fuka, and that Shizu herself is too quiet for him. Fuka promises Shizu that she won't take Takaishi.

(Source: Wikipedia)