Immortal Boy Exiled to an SSS Class Dungeon ~ Achieves Max Level and Becomes the Strongest ~

I had been cursed with the absolute inability to die. Because of that, I was bought as a s*ave and used by the S-rank party “Chosen Ones of the New Generation.” Thanks to them, I ended up stranded alone in an SSS-class dungeon. However, I couldn’t die, and I continued to be almost killed by monsters over and over again. My mind and body were both in tatters, and no matter how much I wished to die, I couldn’t even achieve that. In the middle of all this, somehow, I began to grow stronger gradually. By the time several thousand years had passed, I could take down even SSS-rank monsters on my own. Finally, I challenged the boss of that layer and, after hundreds of years, managed to secure a...