I've Been Killing Slimes for 300 Years and Maxed Out My Level

I've Been Killing Slimes for 300 Years and Maxed Out My Level

On AT-X

2021–20252 seasons24 episodes24 min7.8 / 10

A cozy, whimsical isekai comedy about an immortal witch who accidentally becomes the world's strongest through centuries of mundane slime-killing, centered on found family and the collision between her desire for peace and her newfound legendary status.

After dying of overwork in the real world, I’m reincarnated as an immortal witch, and I spend 300 years enjoying a relaxing life. At some point, though, I end up at level 99! All those years spent killing slimes to make the money to pay the bills gave me a ton of experience points. Rumors of the level 99 witch spread, and soon I’m up to my ears in curious adventurers, duelist dragons, and even a monster girl calling me her mom! I’ve never been on an adventure, but I’m the strongest in the world… What’s going to happen to my relaxing life?!

Where to watch

Questions people ask

  • Is I've Been Killing Slimes for 300 Years and Maxed Out My Level easy watching? Yes, very. More comforting than 97% of series.

  • Does I've Been Killing Slimes for 300 Years and Maxed Out My Level leave you hopeful? Yes, very. More hopeful than 97% of series.

  • Is I've Been Killing Slimes for 300 Years and Maxed Out My Level scary? Barely. Less frightening than 76% of series.

  • Is I've Been Killing Slimes for 300 Years and Maxed Out My Level sad? Barely. Less sad than 75% of series.

  • Is I've Been Killing Slimes for 300 Years and Maxed Out My Level violent? Not especially. Less violent than 61% of series.

These describe how the series comes across across its whole run, compared with other well-known series. They are not a content list — nothing here was counted or checked episode by episode, so for age-suitability or specific content use a classification board or a dedicated content-warning service.

44/ 100

Cinnamon Score

How much this series gives you that nothing else will, and whether it delivers.

You have seen this shape before.

Rarity56

How unlike any other series this one feels

Surprise30

How much more it delivers than it promises

Love49

How much audiences actually like it

The highest scores in the catalogue →

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Everything like I've Been Killing Slimes for 300 Years and Maxed Out My Level, and what each one shares →

Like I've Been Killing Slimes for 300 Years and Maxed Out My Level

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Like I've Been Killing Slimes for 300 Years and Maxed Out My Level, But Darker

Similar, pushed toward heavier and more intense.

Like I've Been Killing Slimes for 300 Years and Maxed Out My Level, But Lighter

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