Beginning after the End, Vol. 1 (comic)

King Grey, a powerful ruler, finds his life cut short but is reborn as Arthur Leywin in a world brimming with magic and monsters. Armed with memories of his past life and a fierce desire to protect his new family, Art dedicates himself to mastering swordplay, mana manipulation, and magic. He strives to become strong enough to face the dangerous forces threatening his second chance at life.