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.
We will soon be holding a large 
festival to celebrate his birthday.
Wir haben beschlossen,
Tendremos un gran festival 
para celebrar su cumpleaños.
Une grande fête
Presto terremo una grande festa 
per il suo compleanno.
Nós vamos preparar um grande
 festival no aniversário dele.
Скоро у него день рождения,