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?!
You can now watch I've Been Killing Slimes for 300 Years and Maxed Out My Level online on the following streaming providers in the United States.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | I Maxed Out My Level | 2021-04-10 | 30 min |
| Season 1 | Episode 2 | Along Came the Daughters | 2021-04-17 | 30 min |
| Season 1 | Episode 3 | Along Came an Elf | 2021-04-24 | 30 min |
| Season 1 | Episode 4 | We Went to a Dragon's Wedding | 2021-05-01 | 30 min |
| Season 1 | Episode 5 | A Ghost Appeared | 2021-05-08 | 30 min |
| Season 1 | Episode 6 | Along Came a Leviathan | 2021-05-15 | 30 min |
| Season 1 | Episode 7 | We Beat Up a Demon King | 2021-05-22 | 30 min |
| Season 1 | Episode 8 | A Fake Witch of the Highlands Appeared | 2021-05-29 | 30 min |
| Season 1 | Episode 9 | My Daughter Turned Into a Slime and Couldn't Change Back | 2021-06-05 | 30 min |
| Season 1 | Episode 10 | A Minstrel Came to Town | 2021-06-12 | 30 min |
| Season 1 | Episode 11 | I Ate a Mushroom and Turned Into a Child | 2021-06-19 | 30 min |
| Season 1 | Episode 12 | We Opened a Coffee Shop | 2021-06-26 | 30 min |
| Season 2 | Episode 1 | Along Came a Goddess | 2025-04-05 | 30 min |
| Season 2 | Episode 2 | Episode 2 | 2025-04-12 | 30 min |
| Season 2 | Episode 3 | Episode 3 | 2025-04-19 | 30 min |
| Season 2 | Episode 4 | Episode 4 | 2025-04-26 | 30 min |
| Season 2 | Episode 5 | Episode 5 | 2025-05-03 | 30 min |
| Season 2 | Episode 6 | Episode 6 | 2025-05-10 | 30 min |
| Season 2 | Episode 7 | Episode 7 | 2025-05-17 | 30 min |
| Season 2 | Episode 8 | Episode 8 | 2025-05-24 | 30 min |
| Season 2 | Episode 9 | Episode 9 | 2025-05-31 | 30 min |
| Season 2 | Episode 10 | Episode 10 | 2025-06-07 | 30 min |
| Season 2 | Episode 11 | Episode 11 | 2025-06-14 | 30 min |
| Season 2 | Episode 12 | Episode 12 | 2025-06-21 | 30 min |
| Sound | Aguri Oonishi | Theme Song Performance |
| Sound | Yui Ogura | Theme Song Performance |
| Directing | Kunihisa Sugishima | Series Director |
| Writing | Naohiro Fukushima | Series Composition |
| Visual Effects | Hikaru Kodama | Character Designer |
| Sound | Keiji Inai | Original Music Composer |
| Writing | Kisetsu Morita | Novel |
| Art | Benio | Original Series Design |
| Visual Effects | Benio | Character Designer |
