A Poor Adventurer and Bottom-Tier Streamer Goes Viral

The middle-aged man was at the very bottom, both economically and as an adventurer. A dungeon appeared in his backyard, but because the first small-fry enemy was a slime, it was certified as an F-rank dungeon. And so, 18 years passed. The middle-aged man’s true strength is finally brought to light. The F-rank dungeon was actually an SSS-rank dungeon. The initial small-fry enemy was an Iron Slime. Its characteristics are that it yields a massive amount of experience points, is incredibly hard, and runs away. When cornered, it secretes an acid that melts even the supposedly indestructible dungeon walls. Fifteen years spent in such a dungeon made the middle-aged man the strongest. The strongest monster, who had been hidden from the world, now steps out into the public eye.