Arthur Pendragon, the second prince of Britten, curses his fate as he's sent to the guillotine. He died due to a people's revolution ignited by heavy taxes and the tyranny of the nobles. However, he wakes up back in his room five years ago, as a boy. To escape execution, he starts by being kind to his maid, and hears a mysterious voice: 'Good deed points added. The future will slightly change.' Arthur, taking this as salvation, performs good deeds for his own life, eventually becoming the greatest king in history—the 'Holy King'. This is a story of a naive boy who learns and grows while striving for survival.