The Beginning After the End, Vol. 1 (comic)

King Grey is a remarkable ruler with a prosperous reign, and yet...opulence and success cannot bury emptiness and solitude. His time as king, however, comes to an abrupt end, and he reincarnates as Arthur Leywin-a baby born in a world of magic and monsters. Equipped with memories of his previous life and the desire to protect the newfound warmth surrounding him, Art begins his journey of becoming a strong warrior once again. Sword training, mana coreformation, magic studies-Art does it all in order to be as powerful as can be! But will it be enough to repel the dangerous forces that threaten his second chance at life...?