Isaac and the Black Sword Knights are responsible for training the Maihama army. While he's in Maihama Isaac gets to know the new crown prince of Maihama, a young boy named Iselus.  Iselus respect looks up to Isaac and respects him.
At a party for the crown prince's birthday, assassin's make an attempt on his life.
I thought he was just some rich kid.
Ich dachte, er wäre
nur ein verwöhnter Bengel,
Pensé que solo era un niño rico.
Je le prenais
pour un simple fils à sa maman,
Credevo fosse solo un bambino ricco,
Achei que ele era só uma criança rica.
Я думал, это всего лишь карапуз,