Amadare no Koro

Suguru and Yoshiichi were neighbors who were always together until the day Suguru had to move away. When they entered junior high, as promised, Suguru came back. But he was unable to transition into their high school, so he is thinking of taking exams for other schools. Yoshiichi's image of the Suguru who's always by his side shatters a bit. He became upset, lonely and jealous. Even when his heart swells so much and all he can think of is him...

(Source: Ichijinsha, translated)