I Want to Be a Receptionist in This Magical World, Vol. 3 (Manga) - Mako

At last, Nunally has her dream job working in the Hall! But even now, she can't seem to untangle herself from her longtime rival, Rockmann! One day, the Order of Knights requests her help investigating an area where missing people had been found. But she comes to discover that Rockmann is part of the group too! What's worse- he's spending every free moment teasing her along the way... After the unexpected events of the ball, Nunnally returns to work ready to forget about Rockmann--until he shows up at her offiffice's front door. Rockmann and the Royal Order of Knights arrive to investigate demonic activity, and he's roped Nunnally into joining them. ThThe hot and cold duo can barely go a minute without bickering, but does this excursion have the potential to uncover something more?