I May Be a Guild Receptionist, but I'll Solo Any Boss to Clock Out on Time Guild no Uketsukejou desu ga, Zangyou wa Iya nanode Boss wo Solo Toubatsu Shiyou to Omoimasu

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)