Senki to Yobareta Otoko, Ouke ni Ansatsu saretara Musume wo Hiroi, Issho ni Slow Life wo Hajimeru: Innocent Days

Audre, a mercenary feared far and wide as the "War Demon," survived an assassination attempt on the night of the peace agreement that ended the conflict. Faking his own death, he slipped away to his childhood hometown, hoping to embrace a quiet, solitary existence. Instead, he found himself face-to-face with a five-year-old girl named Maria, who immediately greeted him as "Daddy." Now, the unwed former soldier has unexpectedly become a single father, and the deadliest warrior on the battlefield is about to discover whether his greatest strength lies in raising a child.