Ameagari no Bokura ni Tsuite

From Huffly Parfait Scans:
Just like the rain unnoticeably stopping, we fall in love slowly??

Given up on love, Kanade is a businessman living an unfulfilled life while hiding the fact that he was gay.
On one of these days, Mashiro, a classmate Kanade secretly loved during high school, shows up.
A reunion after 6 years, and their world begins to change.

This is a clumsy, gentle love story between a pessimistic, pure boy and a determined, oblivious man, trying to find a sunspot.