The Fastest Evolution of the Unrivaled Slime: My Rejected Skill was a Cheat for Super Efficient Leveling, So I Trained 100 Times Faster to Become the World’s Strongest Chapter 19 Discussion

From the Title, what it says is what you get. Guy not great at fighting can level up fast with his slime skill and the skill does more as he goes higher in level. The development of his levels and skills are as fast in story as the title implies. Translation has few typos so all in all it's fairly amusing but doesn't have anything to make it stand out.