I've Been Killing Slimes for 300 Years and Maxed Out My Level manga volume 1 features story by Kisetsu Morita and art by Yuusuke Shiba.

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!

I've Been Killing Slimes for 300 Years and Maxed Out My Level manga volume 2 features story by Kisetsu Morita and art by Yuusuke Shiba.

After 300 years of a laid-back life, witch Azusa's peace is interrupted by a host of wacky challengers after the word spreads that she actually is ridiculously strong. What sort of adventures and new friends will her rapidly expanding family encounter in the next volume?!

I've Been Killing Slimes for 300 Years and Maxed Out My Level manga volume 3 features story by Kisetsu Morita and art by Yuusuke Shiba.

All Azusa wants is to kick back, relax, and live a lazy, laid-back life with her growing family. But her newest family member is quite the troublemaker, dragging Azusa into the midst of all kinds of conflicts... Will Azusa ever regain her peace?

I've Been Killing Slimes for 300 Years and Maxed Out My Level manga volume 4 features story by Kisetsu Morita and art by Yuusuke Shiba and Benio.

An invitation from Beelzebub leads to a family field trip to her homeland in the land of demons! But in the midst of such an important ceremony, will Halkara be able to mind her manners and avoid insulting the Demon King? Or will the Great Slime's prophecy come true?