Lein: In The Reverie of the Failed Heroes

300 years ago, when the world plunge into chaos and demon kings threatened to conquer the world. A lone hero stood in their way, fighting against evil and protecting humanity. However, just as when the world needed him the most and the fight against the demons reached its peak, he hid his tails and ran away in cowardice, leading the world to fall at the hands of the demon kings.

Many years later, Lein, obsessed with the story of the heroes and villains from the past but at the same time loathing the now called \"Foolish Failed Hero\" entered a state of awakening upon receiving a vision, and amidst all this, a strange, mysterious entity spoke to him. Granting him of his outmost desire.