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

"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?"--Provided by publisher.