Because Sparrow's Hotel is located downtown, dangerous things like over-drinking and fights are commonplace, which causes trouble for manager Shiokawa Tamaki. Then Satou Sayuri approaches the front desk for a job interview, listing her special skills as "large breasts" and "assassination." She is hired on a trial basis as a special task force and guard, but... Massive strength! Massive breasts?! (Crunchyroll.com