After being betrayed by a hero in a dungeon, the sword master meets an elf girl in the depths of the earth. While being doted on by the yandere elf, he takes revenge on the hero and gets revenge in a spectacular way.

"I'll claw my way back up, just you wait!"

Chosen by the Sword Saint, Kaim is tasked with defeating the Demon Lord and ventures into the labyrinth where the Demon Lord dwells. However, deep within the dungeon, he is betrayed by a fellow hero and is forced to take a desperate leap into a great chasm.

As Kaim wandered through the underground labyrinth, he eventually discovered a magic-sealed door. Beyond it, an elven girl with immense power, thought to be long extinct, lay sealed away. Upon seeing Kaim, the girl uttered a single wish.

"Please kill me," she said. But Kaim saved the girl, made her his companion, and began his escape from the Demon Lord's lurking labyrinth and his quest for revenge against the hero.