I've Been Killing Slimes for 300 Years

Season 1
Season 2

Original Title

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 (Suraimu Taoshite Sanbyaku-nen, Shiranai Uchi ni Reberu Makkusu ni Nattemashita)

Original Language

Japanese

Dubbing Studio 1

Studiopolis
(Season 1)

Dubbing Studio 2

Crunchyroll
(Season 2)

Recorded

2021
(Season 1)

2025
(Season 2)

Dub Country

United States

Original Country

Japan

Seasons

2

Episodes

22+

Year

2021-present

I've Been Killing Slimes for 300 Years and Maxed Out My Level is a 2021 anime based on the light novel series by Kisetsu Morita.

It premiered in Japan from April 10, 2021 to June 26, 2021, consisting of 12 episodes. The second season premiered on April 5, 2025.

Crunchyroll licensed the series, while Studiopolis produced an English dub of the series, which premiered on its streaming service on May 29, 2021. The second season of the anime premiered on April 5, 2025. The second season's English Dub premiered on April 19, 2025.^[1]

Synopsis

An at-home comedy about a powerful girl who doesn’t work too hard!(⋈◍ ˃ᴗ˂ ◍)。✧♡

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! “This isn’t a dojo, so don’t come here to fight me…!” I’ve never been on an adventure, but I’m the strongest in the world…

What’s going to happen to my relaxing life?!

Cast[]

Image	Character	Seiyū	Dub Actor	Season(s).	Ep(s).
Main Characters
	Azusa Aizawa	Aoi Yūki	Skyler Davenport	1-2	1-14
	Azusa Aizawa	Aoi Yūki	Kelly Greenshield	2	15-
Secondary Characters
	Laika	Kaede Hondo	Rachelle Heger	1-2
	Falfa	Sayaka Senbongi	Lizzie Freeman	1-2
	Shalsha	Minami Tanaka	Suzie Yeung	1-2
	Halkara	Sayaka Harada	Xanthe Huynh	1-2
	Beelzebub	Manami Numakura	Erica Mendez	1-2
	Rosalie	Riho Sugiyama	Anne Yatco	1-2
	Flatorte	Azumi Waki	Amber Lee Connors	1-2
	Vania	Ari Ozawa	Allegra Clark	1
	Vania	Ari Ozawa	Kelsey Maher	2
	Fatla	Miku Itō	Veronica Taylor	1
	Fatla	Miku Itō	Abigail Blythe	2
	Fighsly / Fighter Slime	Ayasa Itō	Veronica Taylor	1
	Fighsly / Fighter Slime	Ayasa Itō	Abigail Blythe	2
Recurring Characters
	Natalie Jr.	Sayaka Kikuchi	Ryan Bartley	1-2
	Pecora / Provat Pecora Allières	Yukari Tamura	Corina Boettger	1-2
	Goodly Godly Godness	Kikuko Inoue	Veronica Taylor	1
	Goodly Godly Godness	Kikuko Inoue	Abigail Blythe	2
	Eno	Hikaru Tono	Anairis Quiñones	1-2
	Kuku	Kotori Koiwai	Tara Sands	1
	Wizly / Wizard Slime	Miyuri Shimabukuro	Cristina Vee	1
	Sandra	Yui Ogura	TBA	2

Episodic Characters[]

Image	Character	Seiyū	Dub Actor	Ep(s).
Season One
	Ernst	Shinya Takahashi	Chris Hackney	1
	Natalie Sr.	Eri Yukimura	TBA
	Adventurer	Kōhei Yanagi	TBA
	Bruja	Sakura Nakamura	TBA
	Leila	Sakura Nakamura	TBA	4
	Leila's husband	Sōsuke Shimokawa	TBA
	Laika's father	Ryō Sugisaki	TBA
	Laika's mother	Saki Suzuki	TBA
Season Two
	Forahn (Waterfall Spirit)	Kako Ikura	Rebecca Danae	14
	Misami (Cloud Spirit)	Emiko Takeuchi	Hannah Magers	14
	Pondeli	Yūko Ōno	Nia Celeste	14-15
	Yufufu	Ai Kayano	Kristin Sutton	14, 17

Additional Voices[]

Season One[]

Season Two[]

Notes[]

This is Skyler Davenport, Rachelle Heger and Anairis Quiñones's first anime dub at Studiopolis.
Abigail Blythe replaces Veronica Taylor as Fatla, Fighsly / Fighter Slime and Goodly Godly Godness in Season 2, possibly due to scheduling conflicts.
Kelsey Maher replaces Allegra Clark as Vania in Season 2, possibly due to scheduling conflicts.
Kelly Greenshield temporarily replaces Skyler Davenport as Azusa Aizawa starting with Episode 15 due to unknown reason.