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--
is to bring it down 
with a single headshot.
هي إسقاطه بإصابة رأسيّة واحدة
ist es das Beste, die Beute
mit einem Kopfschuss zu erlegen.
lo mejor es matar
con un solo disparo en la cabeza.
lo mejor es matar
con un solo disparo en la cabeza.
il faut toucher en pleine tête
pour l’empêcher de bouger.
Bisogna abbattere la preda
con un singolo colpo alla testa.
...é derrubá-lo com um
único tiro na cabeça.
нужно мгновенно убить цель 
попаданием в голову.