I've Been Killing Slimes For 300 Years And Maxed Out My Level (Manga) Vol 01

In this manga adaptation of the funny and heartwarming light novel series, a former office worker decides to live a calm and peaceful life after dying of overwork-despite becoming the most powerful witch in a new world! For readers ages 13 and up. Yen Press
(W) Kisetsu Morita (A/Ca) Yuusuke Shiba