Bound by unwavering loyalty, the world's top assassin faces betrayal from the organization he pledged his life to. In a twist of fate, a goddess offers him a chance at reincarnation in a fantastical realm of swords and sorcery, tasking him with a mission to save this world by eliminating its hero. Reborn as Lugh Tuatha Dé within a family of noble assassins in the Alvan Kingdom, he hones new lethal skills under his father's tutelage, trading his ruthless past for a more intricate and compassionate approach to killing. As he garners allies and unveils his newfound abilities, Lugh understands that defeating a formidable foe like the hero demands nothing short of perfection.