The Reason Why We Forget(2016)

Bokura ga Koi wo Ushinau Riyuu

A bittersweet love triangle yaoi where emotions sway between a kind, mysterious older man and childhood friends.

Ohshiro has secretly been in love with his childhood friend Koba. One day, he's drinking at a bar when he is approached by a man named Satoru. At first, Ohshiro is suspicious of the easy-going older man, but as he torments himself over his feelings for Koba, he begins to reach out to Inamura seeking solace in his gentle, accepting ways...

(Source: Renta!)