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--
it also improves dynamic visual acuity, 
depth perception, and low-light vision.
بل تحسّن الحدّة البصريّة الحركيّة
والعمق والإدراك والرؤية في الضوء المنخفض
sondern auch die Sehschärfe,
die Tiefenwahrnehmung
Il renforce l’acuité visuelle dynamique,
stéréoscopique, et la vision de nuit.
ma potenzia la percezione del movimento
e della profondità, e la vista al buio.
também melhora a acuidade visual dinâmica,
percepção de profundidade e visão na penumbra.
а также различать цель в движении,
определять глубину и видеть в темноте.