Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita

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

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Alternative Titles

Synonyms: Slime 300
Japanese: 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
English: I've Been Killing Slimes for 300 Years and Maxed Out My Level
German: I've Been Killing Slimes For 300 Years And Maxed Out My Level
Spanish: I've Been Killing Slimes For 300 Years And Maxed Out My Level
French: La Sorcière invincible tueuse de Slime depuis 300 ans
More titles


Type: TV
Episodes: 12
Status: Finished Airing
Aired: Apr 10, 2021 to Jun 26, 2021
Premiered: Spring 2021
Broadcast: Saturdays at 21:00 (JST)
Licensors: None found, add some
Studios: Revoroot
Source: Light novel
Genres: ComedyComedy, FantasyFantasy, Slice of LifeSlice of Life
Duration: 23 min. per ep.
Rating: PG-13 - Teens 13 or older


Score: 7.011 (scored by 9900099,000 users)
1 indicates a weighted score.
Ranked: #37832
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #722
Members: 251,457
Favorites: 1,539

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Ranked #3783Popularity #722Members 251,457
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In role-playing games, slimes are usually the easiest monster to kill, and because of that, they yield few experience points. But what would happen if you live long enough to keep defeating them for 300 years?

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, like the dragon Laika and the elf Halkara, 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.

[Written by MAL Rewrite]


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Episode Videos

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Characters & Voice Actors


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Kimura, Nobukage
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Sound Director
Pettini, Emmanuel
Yuuki, Aoi
Theme Song Performance


Opening Theme

Apple Music
Amazon Music
Youtube Music
"Gudafuwa Every Day (ぐだふわエブリデー)" by Aoi Yuuki

Ending Theme

"Viewtiful Days!" by Azumi Waki

Jun 26, 2021
ren0080 (All reviews)
How do I even start with this review...
Simply to put it in a few words, I don't like this anime. It's not because I hate this anime, but because there's nothing I like here. Hear me out. There's nothing really going in this anime. And that frustrates me because of how locked the perspective and the whole premise of this show is. Something like this can easily be fit within a 12 minutes cour season. Not a full 24 minutes cour season.
To put it simply, this anime is just a huge waste of time.
There's really no point in this anime existing. What's the point read more
Jun 26, 2021
KANLen09 (All reviews)
Slimes. Everyone knows what it is. They are more often than not, one of the first creatures one will encounter in video games of fantasy worlds, bar none. As such, they are easily defeated. It’s only when one faces more than a blob of slime that they can get to be a problem, because they attack in groups or in tandem with other types of monsters. In essence, simes find great power in numbers. So why does one kill them if they are too stupid to mean any real ill will? They’re not just holders of experience and loot. Some kill them because they reproduce read more
Jun 26, 2021
khaosklub (All reviews)
it's an isekai in name only. aside from the first episode and mention of reincarnation in the last episode, the isekai aspect of the show has no bearing on it. The first episode is a snore, as it explains her being isekai'd and sets things up for the show to actually begin. The ONLY way her being reincarnated in this world factors in is as a motivation for her wanting to live an easy laid back life.

So, while this is technically an isekai, I wouldn't consider it one. Our main character reincarnates and the story starts after a 300 year time skip of our read more
Jun 26, 2021
Kuten (All reviews)
In the vast sea of isekais about defeating demon lords and getting trapped in a game world emerges Slime 300, an isekai that's all about living a peaceful life... and slaying slimes. Slimes are what's known to be the most common and well, less rewarding monsters to kill in RPG games. However, this anime takes the entire weak concept of slimes to the spotlight and makes the MC slaughter them for 300 years only to achieve the max level. Think that's a good idea? Well, we'll see.

Characters: 7/10
Art and Animation: 5/10
Music and Sounds: 5/10
Story: 6/10
Enjoyment: 10/10

Overall: 6.6 (7)

[Characters 7/10]
Let's start with what builds the entire read more


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