I've Been Killing Slimes for 300 Years and Maxed Out My Level 2021
What is I've Been Killing Slimes for 300 Years and Maxed Out My Level?
I've Been Killing Slimes for 300 Years and Maxed Out My Level is an anime television series that premiered in April 2021. The story follows a woman who dies from overwork in the real world and is subsequently reincarnated as an immortal witch.
- Type
- TV series
- Year
- 2021
- Status
- Ended
- Episodes
- 24
- Runtime
- 24 minutes
- First aired
- Apr 10, 2021
- Last aired
- Jun 21, 2025
- Original language
- JA
- Origin
- JP
- Networks
- AT-X
- Genres
- Animation, Comedy, Sci-Fi & Fantasy
- Updated
Where to watch
Stream
Crunchyroll
Crunchyroll Amazon ChannelBuy
Apple TV StoreStream
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Crunchyroll Amazon ChannelCrunchyrollBuy
Apple TV StoreStream
CrunchyrollCrunchyroll Amazon ChannelStream
CrunchyrollCrunchyroll Amazon ChannelStream
CrunchyrollCrunchyroll Amazon ChannelStream
CrunchyrollCrunchyroll Amazon ChannelBuy
Apple TV StoreStream
CrunchyrollStream
Crunchyroll
Sony LivCrunchyroll Amazon Channel
Anime Times Amazon ChannelFree
Amazon Prime VideoStream
CrunchyrollCrunchyroll Amazon ChannelStream
NetflixAmazon Prime Video
Disney Plus
Hulu
U-NEXT
Netflix Standard with AdsAnime Times Amazon Channel
dAnime Amazon Channel
Amazon Prime Video with Ads
FODFree
Amazon Prime VideoRent
Amazon VideoStream
CrunchyrollCrunchyroll Amazon ChannelStream
CrunchyrollCrunchyroll Amazon ChannelBuy
Amazon VideoApple TV StoreStreaming availability data provided by JustWatch via TMDB. Availability changes by country and date; verify on the provider before subscribing or purchasing.
How long to binge?
Estimate the schedule using 24 episodes and an average 24-minute runtime.
Trailer
Overview
I've Been Killing Slimes for 300 Years and Maxed Out My Level is an anime television series that premiered in April 2021. The story follows a woman who dies from overwork in the real world and is subsequently reincarnated as an immortal witch. Seeking a peaceful existence, she spends three hundred years living a relaxing life while killing slimes to earn money. Over time, these activities unintentionally grant her enough experience points to reach level 99, making her the strongest being in the world. Her status as a powerful witch eventually attracts unwanted attention, leading to visits from curious adventurers, duelist dragons, and a monster girl who identifies her as a mother figure. These events threaten to disrupt the quiet life she has cultivated. The series adaptation was confirmed in October 2019 and features a voice cast that includes Aoi Yuki and Kaede Hondo. The show is available for streaming on platforms such as Crunchyroll and Netflix. The original creator of the source material is Morita Kisetsu.
Should you watch it?
“A reincarnated immortal witch accidentally becomes the world's strongest by killing slimes for 300 years.”
- Unique take on the overpowered protagonist trope
- Gentle humor and wholesome interactions
- Creative world-building around mundane activities
- Slow pacing may not appeal to action seekers
- Some repetitive elements in early episodes
You enjoy low-stakes fantasy with a strong female lead.
Suitable for teens and up, with mild fantasy violence and comedic situations.
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Cast
Episode guide
Spoiler-Safe Browsing Progress
Season 1 · 12 episodes
Open the complete Season 1 guide & lore primer →- E1 I Maxed Out My Level Mytharc Apr 10, 2021
- E2 Along Came the Daughters Core Apr 17, 2021
- E3 Along Came an Elf Core Apr 24, 2021
- E4 We Went to a Dragon's Wedding Core May 1, 2021
- E5 A Ghost Appeared Core May 8, 2021
- E6 Along Came a Leviathan Core May 15, 2021
- E7 We Beat Up a Demon King Core May 22, 2021
- E8 A Fake Witch of the Highlands Appeared Core May 29, 2021
- E9 My Daughter Turned Into a Slime and Couldn't Change Back Core Jun 5, 2021
- E10 A Minstrel Came to Town Core Jun 12, 2021
- E11 I Ate a Mushroom and Turned Into a Child Mytharc Jun 19, 2021
- E12 We Opened a Coffee Shop Mytharc Jun 26, 2021
Season 2 · 12 episodes
Open the complete Season 2 guide & lore primer →- E1 Along Came a Goddess Mytharc Apr 5, 2025
- E2 We Searched for an Undead Core Apr 12, 2025
- E3 We Went to Beelzebub's House Core Apr 19, 2025
- E4 We Went Looking for a Mandragora Core Apr 26, 2025
- E5 I Became Mama Yufufu's Daughter Core May 3, 2025
- E6 Laika Entered a Martial Arts Tournament Core May 10, 2025
- E7 I Met a Pine Spirit Core May 17, 2025
- E8 We Went Swimming in the Sea Core May 24, 2025
- E9 We Met the Evil Spirit Queen Core May 31, 2025
- E10 We Went to the Demon King's Birthday Party Core Jun 7, 2025
- E11 I Battled a Traditional Goddess Mytharc Jun 14, 2025
- E12 We Opened the Coffee Shop Again This Year Mytharc Jun 21, 2025
Frequently asked questions
Is this series based on a manga or light novel?
Yes, it's adapted from a Japanese light novel series written by Kisaki and illustrated by Shiryu.
What makes the main character so strong?
She gained immense power through 300 years of continuous slime-killing, accumulating experience points unintentionally.
Does the series have a lot of action scenes?
While there are some combat moments, the focus is more on daily life and character interactions.
Is the tone serious or comedic?
The series blends both, with a generally lighthearted and humorous approach to fantasy tropes.
How does the main character interact with others?
She attracts various followers and companions who seek her out due to her legendary status.