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.
If we end up going home, we'll have to tell Sia.
Wenn wir in unsere
alte Welt zurückkehren,
 ¡Será un éxito de éxitos!
Si on trouve le moyen
de retourner dans notre monde,
Se andremo a casa, dovremo dirlo a Sia.
Se formos embora, teremos
 que falar com a Sia-chan.
Если возвращаться в другой мир,