I May Be a Guild Receptionist, but I'll Solo Any Boss to Clock Out on Time, Vol. 3 (light novel) — Mato Kousaka

BIRTHDAY BREAK OR BUST!Despite her best efforts, Alina Clover once again finds herself sneaking off in the night to smash dungeon monsters (and walls) to cut down on her over time. But a glimmer of hope emerges when she hears about a new policy being implemented at the office: Employees who submit an effective business betterment plan will be given a day off on their birthday. Alina is determined to snag that birthday break yet is totally stumped when it comes to ideas. Maybe she can get some inspiration at the annual receptionist training seminar…But with this much overtime, will she even get to go?