overview
Skill Eater is a roguelike game in which you become a slime and grow by stealing the skills of your opponents. Eat the various humans and monsters that stand in your way to grow and defeat the bosses that await you.

explanation
A world where humans and monsters, humans and humans, and monsters and monsters fight each other━━━
In such a world, there was a country of monsters called Mu-Izuwazu, commonly known as the Demon Kingdom.

The player, Sena, the Demon Lord of the Demon Kingdom, is betrayed by his subordinate Liza and is forced from his position and transformed into a slime.
The only skills that can be used after being turned into a slime are the "Predation" skill and a few other skills.
Sena tries to eat her enemies, steal their skills, and regain her position as Demon King...