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.
Until now, you've carried that heavy 
burden yourself, haven't you?
Sie haben doch auch einen Teil
der Verantwortung übernommen, oder?
Tú has cargado con eso hasta ahora, ¿no?
Toutes ces responsabilités,
vous aussi vous les avez endossées,
Finora lo hai portato tu, no?
Você carregou esse fardo até agora, não foi?
Ты ведь и сам нёс на плечах
нелёгкий груз.