I've Been Killing Slimes for 300 Years and Maxed Out My Level (2021)
A cozy isekai comedy about an immortal witch who accidentally becomes the world's most powerful sorceress one slime at a time.
I've Been Killing Slimes for 300 Years and Maxed Out My Level - Series Information
- 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
- First Air Year: 2021
- Last Air Year: 2025
- Type: TV Series
- Genres: Animation, Comedy, Sci-Fi, Fantasy
- Content Rating (US): TV-14
- Episode Runtime: Average runtime per episode (24 minutes)
- Number of Seasons: 2
- Number of Episodes: 24
- Status: Ended
- Original Language: Japanese
- Spoken Languages: Japanese
- First Air Date: April 10, 2021 (United States - TV-14), April 10, 2021 (Canada - 14+), April 10, 2021 (Germany - 12), April 10, 2021 (France - 12), April 10, 2021 (India - U/A 16+), April 10, 2021 (Australia - M), April 10, 2021 (Brazil - 14), April 10, 2021 (Mexico - B-15)
- Networks: AT-X
- Production Companies: REVOROOT, Nippon Columbia, Hakuhodo DY Music & Pictures, BS11, STUDIO MAUSU, AT-X, THE KLOCKWORX, movic, DMM GAMES, Bushiroad
- Production Countries: Japan
- Alternative Titles: Убивая слизней триста лет, сама того не заметив, я достигла максимального уровня (RU), Slime Taoshite 300Nen Shiranai Uchi Ni Level Max Ni Nattemashita Sono Ni (JP), 打了三百年的史莱姆，不知不觉就练到了满级 (CN), Slime Taoshite 300-nen (CL), Tanpa Sadar Levelku Mentok Setelah Membasmi Slime Selama 300 Tahun (ID), La Sorcière invincible tueuse de Slime depuis 300 ans (FR), 슬라임을 잡으면서 300년, 모르는 사이에 레벨MAX가 되었습니다 (KR)
I've Been Killing Slimes for 300 Years and Maxed Out My Level - Plot
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?!
I've Been Killing Slimes for 300 Years and Maxed Out My Level - Trailer
Watch the official trailer and see Azusa's surprisingly eventful peaceful life unfold:
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I've Been Killing Slimes for 300 Years and Maxed Out My Level - Cast & Crew
Main Cast
- Aoi Yuuki
- Kaede Hondo
- Sayaka Senbongi
- Minami Tanaka
- Sayaka Harada
- Manami Numakura
- Riho Sugiyama
- Azumi Waki
- Yukari Tamura
- Sakura Nakamura
Writers
- Naohiro Fukushima
- Tatsuya Takahashi
- Yutaka Yasunaga
Executive Producers
- Seiji Miyazaki
- Hitoshi Yagi
- Takahiro Yamanaka
I've Been Killing Slimes for 300 Years and Maxed Out My Level - FAQs
Where can you stream I've Been Killing Slimes for 300 Years?
I've Been Killing Slimes for 300 Years and Maxed Out My Level is available to stream on Crunchyroll, including via the Crunchyroll Amazon Channel. Episodes can also be purchased digitally on Amazon Video and Apple TV Store. Crunchyroll remains the primary streaming destination for both seasons.
Is I've Been Killing Slimes based on a light novel?
Yes, the anime is adapted from a light novel series written by Kisetsu Morita and illustrated by Benio, originally published by SB Creative. The story was also adapted into a manga before receiving its anime adaptation, which premiered in April 2021 on AT-X.
Who voices the main character Azusa in the anime?
Veteran voice actress Aoi Yuuki voices Azusa, the immortal witch protagonist. The main cast also includes Kaede Hondo as Laika, Sayaka Senbongi as Falfa, Minami Tanaka as Shalsha, Sayaka Harada as Halkara, and Manami Numakura as Beelzebub, among others.
How many seasons does I've Been Killing Slimes have?
The series has two seasons, each consisting of 12 episodes, for a total of 24 episodes. Season 1 aired in 2021, while Season 2 followed in 2025. The series has since concluded, with its status listed as Ended.
What is I've Been Killing Slimes for 300 Years about?
A woman who died from overwork is reincarnated as an immortal witch in a fantasy world. After 300 years of quietly slaying slimes, she unknowingly reaches level 99. Her peaceful life is then upended by adventurers, dragons, and a monster girl who calls her mom, blending isekai fantasy with cozy slice-of-life comedy.
When did I've Been Killing Slimes first air?
The series premiered on April 10, 2021, broadcasting on AT-X in Japan. It was simultaneously made available internationally through Crunchyroll. The show received a TV-14 content rating in the United States upon its debut.
What genre is I've Been Killing Slimes for 300 Years?
The series blends Animation, Comedy, Fantasy, and Sci-Fi elements. It belongs to the isekai subgenre — stories featuring characters transported or reincarnated into another world — with a strong emphasis on slice-of-life comedy, gentle humor, and an all-female ensemble cast dynamic.
Is I've Been Killing Slimes suitable for younger viewers?
The series carries a TV-14 content rating in the United States, indicating it is suitable for viewers aged 14 and older. The tone is generally lighthearted and comedic, with mild fantasy action and humor, making it accessible to most teenage and adult anime fans.
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