Shiawase ni Naru no sa

From Canis Major Scanlations:

Komatsu lent money to a friend but was betrayed and abandoned by that same person. After drinking to drown his sorrow, he attempts to get home.
On his way, he meets Ayumu drinking alone in a park. Ayumu was dumped by his lover, and what's more, the one who dumped him was a boy! After this fateful encounter brings Ayumu and Komatsu together, their love for each other begins to sprout and grow little by little, their love grows stronger and stronger.