Koi wa Sodatte Ai ni Naru

When Yuzuru Sakurai returned to his hometown to sell fertilizer for his company, he runs into his former classmate Sou Nakamichi who's now working as a farmer. Depressed by his inability as a salesman, Sakurai cheers up and begins to think fondly of his work when Nakamichi comforts him. Even though they weren't friends in school, the two grow closer, and Sakurai begins to think that they could become great friends. Then suddenly, Nakamichi confesses that he always thought Sakurai was cute?!

(Source: Kadokawa, translated)