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I've Been Killing Slimes for 300 Years and Maxed Out My Level

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

  • 2021 –2025
  • Ended
  • TV-14

★ 7.8 TMDB Rating · 243 votes

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?!

Seasons
2
Episodes
24
Episode length
~24m
First aired
Apr 10, 2021
Networks
AT-X
Original language
Japanese
Origin
Japan

Cast of I've Been Killing Slimes for 300 Years and Maxed Out My Level

  • Portrait of Aoi Yuuki

    Aoi Yuuki

    Azusa (voice)

  • Portrait of Kaede Hondo

    Kaede Hondo

    Laika (voice)

  • Portrait of Sayaka Senbongi

    Sayaka Senbongi

    Falfa (voice)

  • Portrait of Minami Tanaka

    Minami Tanaka

    Shalsha (voice)

  • Portrait of Sayaka Harada

    Sayaka Harada

    Halkara (voice)

  • Portrait of Manami Numakura

    Manami Numakura

    Beelzebub (voice)

  • Portrait of Riho Sugiyama

    Riho Sugiyama

    Rosary (voice)

  • Portrait of Azumi Waki

    Azumi Waki

    Fratorte (voice)

  • Portrait of Yukari Tamura

    Yukari Tamura

    Pecora (voice)

Where to Stream I've Been Killing Slimes for 300 Years and Maxed Out My Level by Country

United States
Streaming on CrunchyrollRent or buy on Amazon Video, Apple TV Store
United Kingdom
Streaming on CrunchyrollRent or buy on Apple TV Store
India
Streaming on Crunchyroll
Canada
Streaming on CrunchyrollRent or buy on Apple TV Store
Australia
Streaming on CrunchyrollRent or buy on Apple TV Store

Availability data from JustWatch. Catalogues change often, so check the service before you press play.

Seasons

  • Poster for Season 1 of I've Been Killing Slimes for 300 Years and Maxed Out My Level

    Season 1

    Apr 10, 2021

    12 episodes

    After 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.

  • Poster for Season 2 of I've Been Killing Slimes for 300 Years and Maxed Out My Level

    Season 2

    Apr 5, 2025

    12 episodes

    Get 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.

I've Been Killing Slimes for 300 Years and Maxed Out My Level Trailer

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