Alain, the second prince of the Kingdom of Cors, has faced a dire problem. His mother, the kingās concubine, decided to poison the crown prince to make Alain the next king. However, Alain doesnāt wish to harm his brothers and join the fight for the throne, so he asks Saul, a Matara warrior trapped in the castleās dungeon, for help in order to flee from Cors. To receive Saulās cooperation, Alain must make a special vow with him and confirm itā¦ with his body?!