In the isekai genre where everyone has grand adventures and gathers their own fantasy harem, I can respect the heck out of an overworked office lady that just wants to lounge around her house.
300 Slimes, as it is more manageably called, offers a pretty laid-back Cute Girls Doing Cute Things isekai experience that is just a joy to watch.
Alternative Titles:
- Slime 300
- Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita
- 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
Year Anime Premiered: 2021
Animation Studio: Revoroot
Number of Seasons: 2
Source Material Country of Origin: Japan
Source Material Available: Light Novel, Manga
Entry Last Updated: January 7th, 2026 – Updated light novel completion status.
Where To Start The 300 Slimes Light Novel After The Anime?
If you finished the I’ve Been Killing Slimes for 300 Years and Maxed Out My Level anime and wish to continue the story with the light novel, you can start at:
- If you finished the I’ve Been Killing Slimes for 300 Years Season 1 anime – You can start the light novel at Novel 3
- If you finished the I’ve Been Killing Slimes for 300 Years Season 2 anime – You can start the light novel at Novel 8
Season 2 really jumped through the light novels, adapting a couple events from each book. You may wish to just start where Season 1 left off.
Is The 300 Slimes Light Novel Over?
The 300 Slimes light novel is complete. It ended in 2026 with Novel 30.
Where To Start The 300 Slimes Manga After The Anime?
I’ve Been Killing Slimes for 300 Years and Maxed Out My Level also has a manga. If you want to start the 300 Slimes manga after the anime, you can start at:
- If you finished the I’ve Been Killing Slimes for 300 Years Season 1 anime – You can start the manga at Volume 3, Chapter 14.
- If you finished the I’ve Been Killing Slimes for 300 Years Season 1 anime – You can start the manga at Volume 12, Chapter 66.
Season 2 of the anime jumped through adapting the manga, often skipping a lot of chapters. You may wish to just start where Season 1 left off.
Is The 300 Slimes Manga Over?
The 300 Slimes manga is still ongoing. Since launching in 2018, it usually releases one or two volumes per year.
300 Slimes Spin-offs
- I’ve Been Killing Slimes for 300 Years and Maxed Out My Level Spin-off: The Red Dragon Academy for Girls (Manga, Light Novel, Ongoing) – Laika prequel spin-off
- I Was a Bottom-Tier Bureaucrat for 1,500 Years, and the Demon King Made Me a Minister (Manga, Light Novel, Complete) – Beelzebub prequel
What to Expect From The 300 Slimes Source Material Compared to The Anime?
300 Slimes is a pretty laid-back series, but it also is a series that likes to somewhat do its own things in each adaptation. The manga doesn’t fully adapt everything from the light novel, nor does it adapt the events the same way or sometimes in the same order. The anime doesn’t fully adapt everything from the manga or light novels either, sometimes changing the events and ordering them in its own way.
So if you choose to read light novel or manga after the anime, you will notice some differences, and those differences will continue to be different depending on whether you chose the manga or light novel to continue the story.
The first season of 300 Slimes kept pretty low in scope with what it adapted because it was setting up the characters. Season 2 of the anime went a little… more wild with what it was adapting and when.
There would be some benefit to reading either the manga or the light novel from the beginning, but you definitely don’t need to. 300 Slimes is designed to be cute and relaxing, so won’t miss anything especially important if you just continued on.
Will There Be A 300 Slimes Season 3?
There has been no official announcement of a 300 Slimes Season 3 anime.
No one expected a season 2, so we’ll see.
