
Anime · AT-X
I've Been Killing Slimes for 300 Years and Maxed Out My Level
Who's in it
Cast
The principal ensemble across the run of the series.
The Nutevio profile
TV DNA
How I've Been Killing Slimes for 300 Years and Maxed Out My Level actually feels to watch, measured on the traits our editors track across every series.
Signature profile
I've Been Killing Slimes for 300 Years and Maxed Out My Level reads strongest on World Building, Spectacle and Bingeability.
The scale, internal logic and texture of the world.
Visual ambition — scale, craft and set-piece filmmaking.
How hard it is to stop after one episode.
How often the series is genuinely funny, by design.
How fully written and psychologically layered the ensemble is.
How much each hour depends on the one before it.
How often an episode ends on a hook you can't ignore.
The sustained pressure the series keeps you under.
How much the series is designed to affect you.
The story
What it's about
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?!
The run
Seasons
2 seasons · 24 episodes.

Season 1 · Complete
Season 1
202112 episodes
6.7IMDbAfter many years of being a corporate slave, Azusa Aizawa abruptly passes away due to severe exhaustion. Seemingly headed for the afterlife, she meets a goddess who bestows her with immortality alongside a peaceful life in another world. There, Azusa enjoys her days tending to her farm, protecting the nearby village, and killing about 25 slimes per day—a routine that continues for at least three centuries. However, this rather monotonous cycle begins to change when Azusa suddenly finds out that she has reached level 99—the maximum possible level—from slimes alone. Despite desperately trying to hide this fact in fear of ending her slow life, rumors of her strength spread nevertheless. Soon enough, various people throughout the continent, start to appear at her doorstep—some seeking a battle, others asking for her assistance. Meeting friends and acquaintances who soon become family, Azusa finds she can live a life far better with others than when she was alone.
Best episode · S01E01 I Maxed Out My Level

Season 2 · Complete
Season 2
202512 episodes
6.4IMDbGet ready for more relaxing tales! Azusa Aizawa is a powerful witch who finally reached level 99 and now busies herself with laid-back quests instead. Her family continues to grow as some familiar faces are joined by bright-eyed newcomers. From trips to the beach to a martial arts tournament, you’re invited on Azusa’s carefree and heartwarming adventures of leisure.
Best episode · S02E01 Along Came a Goddess
Where the series peaks
Best Episodes
The hours that define the show, ranked by audience response and editorial signal.

S01E01
I Maxed Out My Level
Aizawa Azusa, a corporate drone who died of exhaustion from overwork in her previous life, is reincarnated in another world, where she decides to live out a slow and uneventful life forever. But then, 300 years later, she discovers that the experience she earned by defeating slimes every day just to keep up her easy lifestyle has brought her to level 99 and made her the strongest in the world. The rumors begin to spread, and soon trouble comes knocking...
- Directed by Nobukage Kimura

S01E04
We Went to a Dragon's Wedding
Laika's older sister Leila is getting married, so Azusa and her friends set off to visit Mount Rokko, the home of the Red Dragons. The mountain is bustling with the many Red Dragons who have gathered for the ceremony. Azusa congratulates Leila and the ceremony carries on in peace... until the Blue Dragons, a tribe with a long-standing grudge against the Red Dragons, attack in full force!
- Directed by Takahiro Okawa
- Written by Yutaka Yasunaga

S01E07
We Beat Up a Demon King
Halkara's knack for inadvertently causing trouble led her to knock out the Demon King Pecora, and now she's locked in a dungeon. As Halkara's execution draws nearer with each passing moment, Azusa rushes to make a potion with her family's help and, with Beelzebub's guidance, takes it to the first-aid room where Pecora is. After tricking the demons guarding the room, Azusa finally reaches Pecora, but then...
- Directed by Mamoru Hatakeyama
- Written by Tatsuya Takahashi

S01E05
A Ghost Appeared
Halkara has built a new Nutri-Spirit factory in a nearby town and is now regularly going there from the cottage in the highlands, but she comes home exhausted every evening. It seems rumors have spread saying there's a ghost showing up at the factory, so she's had to do all the work alone since all the locals are scared to go there. Azusa doesn't deal well with ghosts at all, but she can't bear to let Halkara work herself to exhaustion, so she summons Beelzebub to help and heads to the factory late at night.
- Directed by Yasunori Goto

S01E12
We Opened a Coffee Shop
Festival season has come to the village of Flatta. The festival has been held there for the past 250 years, but as the only person who knows its entire history since it was started, Azusa has distanced herself from it to let the villagers keep their independence. But her family has shown interest in it and seems excited to see it, so she makes up her mind to change the way she interacts with the village tradition... and thus the one-day-only coffee shop, The Witch's House, was born. Will the villagers enjoy this little shop Azusa's family has created?
- Directed by Nobukage Kimura

S01E02
Along Came the Daughters
After becoming the strongest in the world before she even knew it, Azusa entered into a new lifestyle with her first pupil, Laika the dragon, and discovered fun and enjoyment in it that she hadn't known before. But then, one day, a young girl calling Azusa her "mama" shows up and proclaims that her younger sister wants to kill Azusa. But Azusa has no memory of giving birth to these two girls, or of becoming a mother at all...
- Directed by Nanase Tomii
Recently aired
Latest Episodes

S02E12
We Opened the Coffee Shop Again This Year

S02E11
I Battled a Traditional Goddess

S02E10
We Went to the Demon King's Birthday Party

S02E09
We Met the Evil Spirit Queen

S02E08
We Went Swimming in the Sea

S02E07
I Met a Pine Spirit
Behind the series
Created by
Showrunners, creators, executive producers and the writers who set the voice of the series.
The craft
Key Crew
Directing, writing, production, camera, music and editing.
Executive production
- Yuichi IzumiProducer
- Hitoshi YagiExecutive Producer
- Jun MoritaProducer
- Mitsuhiro NanbaraProducer
- Yutaka KashiwagiProducer
- Daichi AmanoProducer
Writing
- Naohiro FukushimaWriter
- Tatsuya TakahashiWriter
- Yutaka YasunagaWriter
Direction
- Takahiro OkawaDirector
- Nanase TomiiDirector
- Kyosuke TakadaDirector
- Ryuta ImaizumiDirector
- Nobukage KimuraDirector
- Toshiaki KanbaraDirector
Cinematography
- Sota MikamiDirector of Photography
Music
- Keiji InaiOriginal Music Composer
Where to watch
Streaming
Availability verified against regional listings.
- Amazon VideoBuy
- Apple TV StoreBuy
- CrunchyrollStreaming
- Crunchyroll Amazon ChannelStreaming
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