The main characters are using standard Japanese (Only Yakusa Chimo uses Hiroshima dialect). There are also scenes using polite language for a superior person and overall wording is polite. Slang words do not appear.
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The main characters use common Japanese in this work. They use a frank and polite way of speaking depending on the scene. Words related to youkai are unique, but slang words do not come out.
The main characters use general Japanese, and a few use a unique phrase to emphasize their own character. This is a strong comedy anime, but they never talk in slang.
There are many scenes where the major characters use polite language. In the case of friends etc, they will talk in a frank tone but they will not use slang.