My Happy Marriage, Vol. 4 (light novel)

On the way back from Kiyoka-s parents- villa, he and Miyo narrowly escape an ambush at the hands of an assailant who refers to Miyo as their -daughter.- So, in an attempt to keep herself safe, Miyo accompanies Kiyoka to his workplace and meets a female soldier named Kaoruko. It is revealed that Kaoruko was previously Kiyoka-s fianc-andidate, which causes complex emotions to swirl in Miyo-s heart. Can she look beyond their shared past? Or will the distraction leave her vulnerable to a hidden threat making its way towards her-?