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.
And Iselus may be a kid, but he's a man.
Itherus mag ein Kind sein,
aber er ist auch ein Mann.
Además, Icelus podrá ser un niño,
 pero es todo un hombre.
Même si c’est un gamin,
Icelus est avant tout un homme.
E poi Iselus sarà anche un bambino,
 ma è già un ometto.
E Iselus pode ser uma 
criança, mas é um homem.
К тому же хоть Исельс и ребёнок,
он всё равно мужчина.