This is the R18 version which includes adult sex scenes! Based on Maomi Leon's shoujo manga.

Minori, an office worker, and her boss Hadano, are constantly arguing with each other. One night, after a company drinking party, Minori and Hatano are having their usual argument, when Minori realizes that she has missed the last train. They decide to spend the night at a nearby capsule hotel, but an incident forces them to share the same unit.