Senpai wants to... tramp over hills and dales?

Carol is an energetic girl, who is slightly annoying and a bit eccentric. Ron, who is a year younger, had been her buddy and little follower since kindergarten. They had been attending the same schools until Carol moved after middle school. Four years later, they met again in the college lecture hall. This is a little story of freshman Ron and his College Senpai, Carol. A lot of things changed between them, but some don’t.