Tsumiki Ogami's Not-So-Ordinary Life Vol 02

From Book 1:

After receiving a pile of thank-you notes from his classmates, Yutaka realizes that maybe, just maybe, he’s beginning to grow closer to them. When the sports festival rolls around, two of Tsumiki’s rivals challenge her to a duel for glory! Yutaka is ready to give his all and cheer for Tsumiki. But right before the final relay race, someone from his past comes back to haunt him, threatening to undo all the work he’s done to grow more confident.