Boyish Kanojo wa Toshishita S Kareshi no Dekiai Choukyou kara Nigerarenai.

Tomboy Yuzu is popular with all the students in her year, boys and girls alike. She helps a lot of the sports teams, though, she she hangs out around boys most of the time.
Then one day in the school infirmary, she met a younger boy named Yousuke. He was resting in one of the beds, and they got to talking. Apparently Yousuke had no friends.....