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 if we do a first and final 
concert simultaneously,
Geben wir dann ein Abschiedskonzert,
wird es doppelt Spaß machen!
Y si hacemos el primer y 
el último concierto al mismo tiempo
Imaginez en live !
Deux idoles pour le prix d’une !
E se facciamo il primo
 e ultimo concerto in uno solo,
E se fizermos um concerto de 
início e fim ao mesmo tempo,
Это будет первый и прощальный концерт!
Так в два раза круче!