Tomoko Arikura (有倉 智子)

Tomoko has been Nanako's best friend and support since childhood. Because of Nanako's admission in the Sorority their relationship - and the trust Tomoko has in Nanako - will be affected negatively.

Differently from the manga, however, in the anime this rift, caused by some lies told by Mariko, will be resolved, and Tomoko will always be by Nanako's side, inciting and helping her as usual in her moments of despair or difficulty.

With the passing of time, Tomoko will also become friends with Mariko, and will defend her in front of the others more than once.