25 Years in a Dungeon: A Suspicious Man Returns as a Dungeon Streamer!

The year is 2025, and the world is suddenly beset by the emergence of dungeons. Among these is a young man named Hiroshi Nagano, who ventures into one of the dungeons and becomes trapped in its uncharted depths for 25 years. During this time, he not only survives by devouring ferocious monsters but also builds a legendary physique through his prolonged exposure to the harsh environment. When he finally returns to the surface, he is greeted to a future Japan where streaming one's dungeon exploration has become a mandatory aspect of the culture. Hiroshi's overwhelming power, honed over a quarter century of brutal survival, propels him to the top ranks of the nation's dungeon explorers.