Kiss Dake ja Gaman Dekinai

Tamaki, a high school boy, is reunited with Azuma, the person he had a crush on during junior high. As they reconnect, the once-distant Azuma gradually grows closer to him. Though Tamaki longs to stay by Azuma’s side, his deep-seated inferiority complex begins to take over, making it harder for him to control his emotions...

(Source: Hakusensha, translated)

Note: The chapter count includes extras.