Elta, having fallen to the lowest level of a certain dungeon, returns to the surface today.

Though he spent ten long years there, he grew up bright and honest thanks to the "friends" he met.

However, there's just one problem.

The place Elta lived was the lowest level of an S-rank, ultra-dangerous dungeon, and what's more, the monsters he called "friends" were all absolute monsters.

And unbelievably, he returned completely unaware of that fact.

As expected, Elta, who grew up in such an environment, possessed monstrous strength.

On top of that, having spent his boyhood in the lowest level, he completely lacks common sense.

Just what kind of chaos will he unleash on the surface, then—?

This is a story about Elta, who constantly gets caught up with his sister and childhood friends, as he unconsciously demonstrates his peerless strength in various places.

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