Based on the erotic game by frill.

Kei works for a large company and is enjoying life to the fullest. His hobby is giving overnight stays to women who have nowhere to go for complicated reasons, and having physical relations in return. As usual, Kei looks around on an app, and when he meets Sana at the appointed place, where she stands alone, he senses something dangerous about her, as she looks more cute and fragile than he had imagined. Usually, his relationship ends without any hard feelings, but he doesn't go all the way with Sana, and they end up meeting again a few days later...

(Source: Parabook, translated)

Note: Includes 1 extra chapter in the digital limited edition.