Jun(1991)

When Takahashi Atsuho, the son of a fisherman, changed classes in his third year of junior high school, he found himself in the same class as Miyamoto Jun, whom he has had a crush on since he entered school. Miyamoto became gradually attracted to Atsuho, who appears rough on the outside but is kind at heart... The two seemed to be getting closer little by little, but...?

(Source: Shueisha, translated)