Sugawara Kimie

Kimie is a treasurer of the student council and as such, she follows Takako around almost all the time. When they are not together, Kimie will go around investigating various matters and report back to Takako. Much like Takako, she has a very serious personality and would not stop at sticking up for Takako when need be.

Spoiler

She becomes the student council president for the next term in Takako's path. She is the seventy-third elder sister and her another name is Kaguya no Kimi.