Rental Kareshi

"Let's do your 'job' as my boyfriend, okay?" Kei works part-time for an agency that provides stand-ins for various roles. While attending a group blind date just to make up the numbers, he unexpectedly runs into his ex-boyfriend, Shinji. The man who used to greet him with a warm smile has completely changed, now wearing a mischievous grin as he asks Kei to act as his stand-in boyfriend. Still unable to get over Shinji, Kei accepts the job despite how painful it is... Even when they're close enough to feel each other's body heat, their hearts remain out of reach.

(Source: BookLive, translated)