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

Storyline

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?!

First Aired

2021-04-10
Last Aired

2021-06-26
Creator
Genre

Animation, Comedy, Sci-Fi & Fantasy
Seasons

2
Episodes

13
Status

Returning Series
Language

日本語
Network

AT-X

Keywords:

witch magic slime immortality reincarnation slice of life anime other world isekai

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

Season 1

Season 2

1. I Maxed Out My Level

Aizawa Azusa, a corporate drone who died of exhaustion from overwork in her previous life, is reincarn...More

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...Less

24mins 2021-04-10

2. Along Came the Daughters

After becoming the strongest in the world before she even knew it, Azusa entered into a new lifestyle ...More

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...Less

24mins 2021-04-17

3. Along Came an Elf

Just as peace is beginning to reign in Azusa's home, a young elf named Halkara shows up pleading for h...More

Just as peace is beginning to reign in Azusa's home, a young elf named Halkara shows up pleading for her help. Halkara says that an energy drink she made angered a terrifying high demon, Beelzebub, who is now out to kill her. Azusa would prefer to avoid anything that might ruin her slow life, but she can't just leave the poor girl to die, so she reluctantly agrees to shelter her...Less

24mins 2021-04-24

4. 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, ...More

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!Less

24mins 2021-05-01

5. A Ghost Appeared

Halkara has built a new Nutri-Spirit factory in a nearby town and is now regularly going there from th...More

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.Less

24mins 2021-05-08

6. Along Came a Leviathan

Azusa receives an invitation from Beelzebub to attend a ceremony in the land of the demons. It seems s...More

Azusa receives an invitation from Beelzebub to attend a ceremony in the land of the demons. It seems she earned a favorable reputation with the demons after stopping the conflict between the two Dragon clans in Laika's homeland. Azusa invites the whole family along for this high honor, but there's one problem: Rosalie, the ghost, can't wear a dress. But Rosalie is part of the family, and Azusa wants to help her dress up like the rest of them, so she uses the power of her maxed level to create a magic spell...Less

24mins 2021-05-15

7. We Beat Up a Demon King

Halkara's knack for inadvertently causing trouble led her to knock out the Demon King Pecora, and now ...More

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...Less

24mins 2021-05-22

8. A Fake Witch of the Highlands Appeared

Laika and Flatorte, the newest member of the family, are constantly bickering. Their tribes do have a ...More

Laika and Flatorte, the newest member of the family, are constantly bickering. Their tribes do have a history of conflict, but it seems the fact that they haven't been eating as much meat lately is contributing to their irritability. Just then, Natalie from the guild arrives and tells them about a quest to get rid of a massive number of longhammer boars, the perfect quest to fill their hungry bellies...Less

24mins 2021-05-29

9. My Daughter Turned Into a Slime and Couldn't Change Back

Falfa woke up in the form of a slime! Of course, that's not too shocking since she's a slime spirit, b...More

Falfa woke up in the form of a slime! Of course, that's not too shocking since she's a slime spirit, but her sister Shalsha laments that this has never happened before and she doesn't know how to change her back. So Azusa sets off with Shalsha and Beelzebub in search of an "unusual slime" who might know a way to change Falfa back...Less

24mins 2021-06-05

10. A Minstrel Came to Town

One day, a girl with rabbit ears comes to the village of Flatta. This nameless, unpopular minstrel, wh...More

One day, a girl with rabbit ears comes to the village of Flatta. This nameless, unpopular minstrel, who strums her lute fiercely with her bare fingers and sings with a death growl, is known as Schifanoia. When she passes out in the middle of her concert, Azusa is reminded of the sad stories she's heard of young men who moved to Tokyo hoping to make their major debut, but instead turn into job-hopping middle-aged men playing in bands that never make any profit. So she invites Schifanoia to live at the house in the highlands for a while, but when she just keeps making excuses and refuses to see reality, Flatorte loses her patience...Less

24mins 2021-06-12

11. I Ate a Mushroom and Turned Into a Child

Halkara throws a mushroom-grilling party, or "shroompa" for short, and accidently includes some poison...More

Halkara throws a mushroom-grilling party, or "shroompa" for short, and accidently includes some poisonous mushrooms that cause anyone who eats them to shrink... and Azusa eats one. This leads to everyone ridiculing her—or rather, fawning over how cute she looks. Even her daughters are in on it! Azusa is determined to change back to normal, so after a tip from Pecora, she heads to the World Tree along with Fatla and Vania to find a pharmacist who deals in every kind of medicine. She expects a dungeon with 108 floors to fight through, but...Less

24mins 2021-06-19

12. We Opened a Coffee Shop

Festival season has come to the village of Flatta. The festival has been held there for the past 250 y...More

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?Less