The world's finest Assassin accepts the Goddess' request to assassinate the Hero. After defeating the Demon Lord and saving the world, the Hero will then use his power to destroy the world. The Goddess wants the Assassin to be reincarnated in another world and assassinate the Hero in order to save it. After being betrayed and killed by his client in his previous life, the Assassin accepts her offer in order to relive his life in a new world, but--
In other words,
أي أنّ عليّ قتل وحش غير عاديّ
باستعمال قدراتي العاديّة
Das heißt also, ich muss
En résumé,
Perciò, io
Ou seja, tenho que matar um monstro fora do padrão
usando minhas próprias habilidades padrão.
Получается, я... должен убить 
необычное чудовище,