AKATSUKA TAISHOU

EnglishSatou Yutaka is the representative for her class at school. She's reliable, cool, and pretty, but tomboyish to a fault. One day, Mutou Chihiro, a straightforward yet motherly boy who admires her, asks her to teach him how to be cool like her.

The original web comic that Mutou and Satou is based on. A story about an unnamed tomboyish girl and her senpai.