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.
That's just what I'd expect to see 
from the Black Sword Knights,
Ist ja auch die Schwarzritterkompanie,
die Macho-Männer Akibas.
Justo lo que esperaba de 
los Caballeros de la Espada Negra,
Tout ça grâce aux Chevaliers Noirs,
les machos durs à cuire d’Akiba !
Proprio come mi aspettavo
 dai Cavalieri della Lama Nera,
Era o esperado dos pessoal do 
Clã Cavaleiros da Espada Negra,
Естественно, ведь это богатыри из Акибы,
Рыцари чёрного клинка!