I'm Not the Final Boss' Lover Vol. 2 (novel) - I'm Not the Final Boss' Lover, #2

Secret meetings. Establishing hierarchy. Slanderous rumors. After she assumed her role as the newly-appointed vice-captain of the Dark Knights, Jun Karentia had a plethora of tasks to accomplish every day. From managing the expedition corps to hunting down traitors and selecting the best agents, she barely had a moment to herself. Moreover, she had to weed out any operatives that wouldn't be of any help in the future. Yet, when she stumbles upon her captain's secret, she finds herself with an additional responsibility.
Mayer Knox needs her help, and Jun cannot refuse, even if it means sacrificing her precious nights. As Jun works tirelessly to assist Mayer, the inhabitants of Nochtentoria Castle begin to whisper about the nature of their relationship. This time, Jun has no one to blame but herself for the rumors. Despite the awkwardness they provoke, gossip is the least of Jun's worries. All of her apprehension is reserved for the terrible disaster that looms on the horizon.
With time slipping away, can she find a solution before the hourglass empties? In every RPG, you must choose your allies carefully.