AKUMADE TAIDA NA AKUYAKU KIZOKU@COMIC

Born as the second son of a villainous duke, Ryuk is a lazy boy with an apathetic attitude. But when he accidentally learns of the disastrous future that awaits him, he scrambles to find a secure marriage and research magic in order to avoid a bad ending for himself. His efforts are supposed to be working towards a peaceful and lazy life, and yet he gets caught up in one mendacious plot after another…! The road to laziness will be a difficult one… A magical sabotage fantasy about a powerless prince who just wants to live a lazy life! (Source: Corona EX, translated) — Description from AniList community (anilist.co).