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.
A bind?
Ketten?
¿Una atadura? No...
– Une technique d’entrave !
– Non, c’est autre chose !
Un bind?
Uma ligação? Não...
— Путы?
— Что-то другое.