I've Been Killing Slimes for 300 Years and Maxed Out My Level  is a Japanese light novel series written by Kisetsu Morita and illustrated by Benio.An anime television series adaptation by Revoroot premiered on April 10, 2021.After living a painful life as an office worker, Azusa ended her short life by dying from overworking. So when she found herself reincarnated as an undying, unaging witch in a new world, she vows to spend her days stress-free and as pleasantly as possible. She ekes out a living by hunting down the easiest targets—the slimes! But after centuries of doing this simple job, she's ended up with insane powers... how will she maintain her low key life now?