That one is so good I bought a signed copy of it, here is the link for those who may desire it, Idk how mangago is with sharing links..but its a comic so yes?
http://alwaysraininghere.com/
ALWAYS RAINING HERE KSKSKSKSKKS I LOVE THAT SO MUCH I THINK I'VE STARTED READING THAT IN 2014
I've read the comic before, and last I knew, all the extras (including the ex-crush's relationship w the mc) are free on the official site?? that one's just written in prose rather than being a comic like the main story
All I remember about the story was that it was about them meeting in the rain with only one of the guys having an umbrella so they end up walking home after a party together (I think). I think I read it back in 2015-2016 and I remember that it had its own website just for reading that one comic. I remember that it was a shounen ai but they might've made it a yaoi in later seasons. I also remember that the title was something with rain and that it was a western comic but that's all.