Ookami-san has arrived at school. Himura Akane, a sophomore and member of the discipline committee, is very studious, but also sincere, petite, and adorable, making her beloved by everyone at school and very popular. One day, the principal asks her to be the tutor in charge of the education of Ookami Ren, the daughter of the board chairman. Since Akane's goal is to enter college on a scholarship, she decides to accept the assignment. However, Ren turns out to be much bigger than her physically and, on top of that, a troublesome girl with a cunning mind full of bad ideas...?! A girls' comedy starring a small and adorable senpai and a big and difficult-to-handle kouhai begins!