Kurihara Touko♀

Kida's classmate. A simple girl that is seen as troublesome by most and a true nuisance by Kida. Despite knowing that she is slow and somewhat bothersome to others, Touko feels she needs to do her best and contribute to the world. Unfortunately, the fact that Touko has never had a chance to prove herself has left her with a desire to find something that will give her own life some meaning. She manages to find that meaning upon meeting Kida, and will do anything to preserve it.

[Edited from Wikipedia]