Our protagonist, Naruchika Ikagami, had been exploring dungeons using a flawed skill, `《Clone》`, which possessed a critical defect: the pain felt by his clones was also transmitted to his main body.

Day after day, he continued to challenge dungeons of a difficulty that would normally be impossible to clear. Despite countless deaths and agonizing pain, each time he memorized enemy movements and optimized his own actions.

He relentlessly honed himself to challenge the abyss that lay far beyond the deepest levels of the dungeon.

His method was precisely like playing a "death game"—a genre where one repeatedly dies to learn and conquer.

Then one day, Naruchika encountered an unexpected situation.

「We have to get out of here!」

「It's fine, I'll be alright.」

It was an Irregular Monster—a disaster that occasionally occurs within dungeons when monsters move between floors irrespective of their designated levels.

In the midst of it all, Naruchika pushed away the hands of the girls trying to stop him, challenging the horde of Irregular Monsters purely for his own training, and in doing so, took down several of them as his clones shattered.

For him, it was merely an extension of his usual training.

However, when his actions were caught on the girls' live stream, the situation took a dramatic turn.

「Who's that kamikaze dude?」

「Lol, charging straight into Irregular Monsters!」

The girls were famous DungeonTubers, boasting 800,000 subscribers and tens of thousands of concurrent viewers.

「Looks like I'm being broadcasted.」

「Big brother, let's seize this chance to start streaming!」

As a result, Naruchika, having been exposed to the internet, started streaming, encouraged by his sister.

Through those streams, the world would come to know Naruchika's true strength and his abnormality, and realize that the place they called the "deep levels" was merely a tutorial.

This is the story of a man who befriended the pain and fear of death, delving deeper into dungeons than anyone else and astonishing the world.

Or, it is the story of a madman dragging the world into the far depths of the dungeon.

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