It has been a long time since you became an adventurer. One day, a request to subdue a succubus was posted. The conditions: a full party of top-tier experts.

In truth, succubi are weak beings in this world. In a world where ability, strength, and skill are everything, a succubus who only seduces was nothing more than the weakest of the weak.

After gathering a party and arriving at the dungeon, you find a massive cave. It looks to be about 50m high and 70m wide.

After clearing it easily, you reach the boss room only to be struck with horror. A truly gargantuan succubus greets the party.

As it turns out, this was an Amplification Dungeon where mana flows continuously. A boss who absorbs mana in such a place evolves to grow large enough to handle the power, becoming incredibly strong.

In other words, this is a catastrophic situation.