I've Been Killing Slimes for 300 Years and Maxed Out My Level - Season 1 - Eps 1: 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...
About I've Been Killing Slimes for 300 Years and Maxed Out My Level

Title: I've Been Killing Slimes for 300 Years and Maxed Out My Level
First Air Date: 2021-04-10
Last Air Date: 2021-06-26
Status: Returning Series
Rating: 7.9/10 (from 208 votes)
Language: JA
Seasons: 2
Total Episodes: 13
Network: AT-X
Genres: Animation, Comedy, Sci-Fi & Fantasy
Production Companies: REVOROOT, Nippon Columbia, Hakuhodo DY Music & Pictures, SB Creative, BS11, STUDIO MAUSU, AT-X, THE KLOCKWORX, movic, DMM GAMES, Bushiroad, Medicos Entertainment, Square Enix
Synopsis
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?!