I've Been Killing Slimes for 300 Years and Maxed Out My Level - Crunchyroll Spring 2021 Spotlight

Kill some slimes with us in our overview of the adaptation!

I've Been Killing Slimes for 300 Years


If you die from overworking, chances are you're also going to go overboard with work in the fantasy world in which you're reincarnated. What happens when an immortal witch spends 300 years grinding and hits level 99 in this new world? Find out in the anime adaptation of I've Been Killing Slimes for 300 Years and Maxed Out My Level, now live as part of the Crunchyroll Spring 2021 Lineup!


For an overview of the new series, look no further than the full spotlight below. 


Official Website


I've Been Killing Slimes for 300 Years 





Launch Info

Launch Time: April 10, new episodes every Saturday at 6:30am PT

Territories: North America, Central America, South America, Europe, Africa, Oceania, the Middle East, and CIS

Show Page


Official Trailers 





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?!


Characters and Cast



VA: Aoi Yūki (Kumoko in So I'm a Spider, So What?)




VA: Kaede Hondo (Kasane Aoba in Keijo!!!!!!!!)




VA: Sayaka Senbongi (Haru in BEASTARS)




VA: Minami Tanaka (Mary Saotome in Kakegurui)




VA: Sayaka Harada (Miharu Ayase in Mythical Spirit Chronicles)




VA: Manami Numakura (Kohaku in Dr. STONE)




VA: Azumi Waki (Rem Galleu in How NOT to Summon a Demon Lord)




VA: Yukari Tamura (Rika Furude in Higurashi: When They Cry)




VA:Riho Sugiyama (Henrietta Penrose in 86 EIGHTY-SIX)







Original Creator

Kisetsu Morita (Story)

Benio (Art)



Nobukage Kimura (Assistant Director on Tsuritama)


Series Composition

Tatsuya Takahashi (Eromanga Sensei)


Character design

Keisuke Gotō (Babylon)

Emi Honda (Key Animation on Tsubasa Chronicle)


Art director

Ken Naitō (K: Return of Kings)


Color design

Satoshi Takezawa (Babylon)


Director of Photography

Sōta Mikami



Keiji Inai (BURN THE WITCHThe Knight in the Area)


Sound director

Satoshi Motoyama (91 DaysDeath Parade)


Opening theme

“Gudafuwa Every Day” by Aoi Yūki


Ending theme

"Viewtiful Days!" By Azumi Waki


Animation production



Additional Info


The anime adaptation of I've Been Killing Slimes for 300 Years and Maxed Out My Level is based on the light novel series written by Kisetsu Morita and illustrated by Benio. Yen Press licensed both it and the manga adaptation by Yusuke Shiba in North America, and you can see the cover of each first volume below.





Joseph Luster is the Games and Web editor at Otaku USA Magazine. You can read his comics at subhumanzoids. Follow him on Twitter @Moldilox.

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