Kimi to Barairo no Hibi

Nobara Mochizuki is a second-year high school student who has yet to fall in love. Her classmates view her as a serious person. One day, her teacher asks her to help out with the supplementary lessons, and there is a student named Setohara-kun, who has a lot of bad rumors about him...!?

(Source: Shueisha, translated)