Kimi ni Somareba

Raised by his grandmother who taught him to help those in need, Neo is popular at school for being good-natured. It is his habit to help anyone who is in trouble. Then one day, he meets his classmate Hira, a handsome model, who is in trouble because he is being chased by a fangirl. As usual, Neo calls out to him, but he is rejected and told, "I don't need your help!"

(Source: Kodansha, translated)