Negative, Mistake
ひ
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A criminal has done an injustice on the world or other people. Being a criminal is a negative thing, and even if it was just a mistake, it was still a crime.
When you commit an injustice, you'll know because heat (ひ) fills your body. Maybe you've never done any kind of big thing, but when you make a mistake your face fills with heat and you turn red!