Yowaki na Kimi to Nagai Shiawase

Ryou Tsukino, a university student, was questioning himself: "...Am I attracted to men?" He wants to put himself out there, so he signs up for a gay Sex Community, "Polaris." However, on the day he meets his partner, when they're about to go to a hotel... He gets cold feet. The one who suddenly appears there is a handsome man he had seen somewhere before. The man, Shinji, who is also a Polaris member, takes him out of there, and sends him home, saying: "Don't come back." For a short while, Ryou is relieved that he doesn't have to have sex with a stranger. But the next day, he discovers that Shinji is a senpai who goes to the same university. Ryou attempts to thank Shinji for helping him out, but...

(Source: Ichijinsha, translated)