Japan Synopsis
スライム倒して300年、知らないうちにレベルMAXになってました
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?!
Also On AT-X
Other series that aired on AT-X.
Sci-Fi & Fantasy + Animation in Japan
719 Japan titles in our catalog blend the Sci-Fi & Fantasy and Animation genres. Below: the top-rated of them (excluding I've Been Killing Slimes for 300 Years and Maxed Out My Level itself).
Other Titles From REVOROOT
The 2020–2022 Japan Window
I've Been Killing Slimes for 300 Years and Maxed Out My Level holds position #90 of 452 Japan seriess in the 2020–2022 window, below highlighted by audience rating.
The 2020s Japan Landscape
2021 was the decade’s peak output year for Japan — 170 titles released, including I've Been Killing Slimes for 300 Years and Maxed Out My Level. Bars below show how the 2020s stacked up year by year (539 total).
Position in Catalog
Released alongside 169 other Japan seriess in 2021.
The 4246th Japan title from Japan we index (earliest catalogued entry: 1899).
Our Japan catalog contains 4,579 titles in total (1,671 seriess).
Audience Engagement
177 audience reviews — more than 84% of Japan seriess in our index.
Popularity sits at the 83th percentile among Japan seriess.
Broadcast Timeline
Reception Benchmarks
Ranked #550 of 4,579 Japan seriess indexed here (88th percentile by TMDB audience score).
Rating is +1.1 points above the Japan average of 6.9/10.
Among Japan Sci-Fi & Fantasy productions specifically: #217 of 758 (top 29%).
Production Details
| Primary Country | Japan |
|---|---|
| Original Language | Japanese |
| Production Companies | REVOROOT, Nippon Columbia, Hakuhodo DY Music & Pictures, SB Creative, Nippon BS Broadcasting |
| Series Type | Scripted |
| Seasons / Episodes | 2 / 12 |
| Release Date | April 10, 2021 |
| Official Site | slime300-anime.com |