I May Be a Guild Receptionist, But I'll Solo Any Boss to Clock Out on Time, Vol. 1 (manga)

Alina Clover thought being a receptionist for the Adventurers Guild would be her ticket to the good life"¦but her dream gig turns into an overtime nightmare whenever adventurers get stuck clearing a dungeon. To save herself from paperwork, Alina turns to the simplest solution at hand"”beating down the monsters herself! A mysterious adventurer showing up out of nowhere, soloing the boss, then disappearing without taking credit is bound to create rumors, and Alina"™s treasured job forbids side hustles. So there might be trouble when the leader of the Silver Sword party discovers her secret"¦!