Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita (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, Slime Taoshite 300-nen, Shiranai Uchi ni Leberu Makkusu ni Nattemashita, Literally meaning "While Killing Slimes for 300 Years, I Became the Max Level Unknowingly") is a Japanese light novel series written by Kisetsu Morita and illustrated by Benio.
Ordinary office lady Azusa Aizawa died due to overwork. For that reason, when she finds herself reborn as an immortal witch with the appearance of a 17-year-old, she decides to live an easy-going life. Her main source of income is collecting magic stones that drop off the slimes that live in the nearby forest and selling them at the nearby village's guild. After doing this for the last 300 years, she's unknowingly become a level 99 witch, the most powerful of all. [tolol]
As of May 2021, seventeen volumes have been released.
A manga adaptation of the same name by Yūsuke Shiba began serialization in Gangan Online magazine under Gangan GA imprint (collaboration with GA Bunko) from June 26, 2017. The first volume was released on January 12, 2018.
Hira Yakunin Yatte 1500-nen, Maō no Chikara de Daijin ni Sarechaimashita (ヒラ役人やって1500年、魔王の力で大臣にされちゃいました, Literally meaning "By the Power of the Demon King, I was Made a Novice Minister in 1500 Years") is the light novel spin-off by the same authors.
- Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita Web Novel
- Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita on Gangan Online
- Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita on GA Bunko
- Kisetsu Morita's Twitter
- Benio's Twitter
- Yūsuke Shiba's Twitter