I've Been Killing Slimes for 300 Years and Maxed Out My Level Vol. 4

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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?
For readers ages 13 and up.