The story follows Grey, once the strongest king in history. Though he wielded unmatched power, wealth, and fame, his life was empty—lacking trust, friendship, and love.

One day, Grey meets his death and is reincarnated as a powerless infant named Arthur in a world filled with magic. Surrounded by a caring family and loyal companions, Arthur begins to experience joys and warmth he never knew in his past life.

However, danger soon strikes when his family is attacked by bandits. Determined to protect his new loved ones, Arthur embarks on a fresh journey of courage, love, and adventure in this second life.