Inbi na Doukutsu no Sono Oku de

山にある寂れた洞窟。忘れられたその洞窟で、生まれるはずのない新たな“魔物”が産み落とされた。

魔物の名前は“ブラックウーズ”。黒い色をした以外はなんの取り柄もない、ただのスライム。

だが、このスライムは「取り込んだ生き物の能力を取り込む」特性を持っていた。

麻痺毒を持った虫を捕食し、人里の家畜を襲い、そして人間を取り込み、人間の知性や“欲望”を手に入れてしまった。

やがて魔物は、洞窟へ探索にやってきたある女魔導師をターゲットに定めた。

世界はまだ知らない。“魔物が産まれた”ことを……。

A world where the Demon King was defeated by a Hero that came from another world. People carelessly forgot about their fear of the Demon King and of monsters, living in peace.

In a forgotten and run-down cave in the mountains, a new monster that should not have been born was given birth.

The monster’s name was the “Black Ooze”. It was nothing exceptional other than its black color, an ordinary slime.

However, this slime had the special characteristic of being able to take the abilities of the living things it swallowed. It preyed on an insect that had paralytic poison, as well as other animals. Following that, it attacked a human, obtaining his knowledge and Desire.

Before long, the monster established its target as the female mage that came to explore the cave.

This world still wasn’t aware.

A Monster Was Born…