Guild no Uketsukejou desu ga, Zangyou wa Iya nanode Boss wo Solo Toubatsu Shiyou to Omoimasu EP 12

I May Be a Guild Receptionist, but I'll Solo Any Boss to Clock Out on Time

Alina Clover signed up to be a receptionist for the Adventurers Guild thinking it would be her ticket to the good life. Unfortunately, her dream gig turns into an overtime nightmare whenever adventurers get stuck clearing a dungeon. To save herself from paperwork, Alina takes to beating down monsters herself to solve the problem! Now she just needs to keep her activities a secret... (Source: Yen Press)