Tonari no Taiyo

Riku graduated junior high regretting being distant and alone. Resolving to make a fresh start in high school, she went to the hair salon to cut her hair short, and there she met Hayate, the younger brother of the salon owner who was helping out. He's handsome, with an easy smile that sparkles like the sun. And it turns out that Hayate will also be Riku's high school classmate! Before she knew it, Riku couldn't take her eyes off him…!

(Source: Kodansha, translated)