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.
Once you master it, you'll be a better swordsman.
Wenn du lernst, es richtig zu benutzen,
verbessert sich dein Können.
Si tu parviens à la maîtriser,
tu deviendras plus fort.
Impara a padroneggiarla 
e sarai uno spadaccino migliore.
Quando conseguir dominá-la,
 será um espadachim melhor.
Привыкнешь — и начнёт получаться.