From Seraphic Deviltry:

Official Japanese
Tora is looking for a job, so he decides to apply for this particular place…What he didn’t know is that this place is a Male’s Brothel. Here he meets Shiro, the most requested male prostitute. At the beginning Tora feels reluctant to work in this environment, but the vulnerability aura that surrounds Shiro makes him stay, plus he needs the money. Everything goes well at first, they stablish this sort of friendship, but shortly after that, feelings, desires and painful secrets complicates their already fragile relationship…

Official English Translation on Futekiya
When his sister gets scammed, Tora takes it upon himself to save up enough to make the money she'd lost back. Responding to an ad looking for a "hotel pick-up driver" leads him into gay escort service "Rain," where he gets assigned to Shiro, their biggest moneymaker. Tora says he isn't gay and definitely isn't interested in Shiro's services, but can he really knock it when he hasn't even tried it?