I finished the game in the harem route but didn't unlock Judgment skill at all?
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Ok I unlocked it! Brutaliity level has to be below 80 when finishing the middle domain: spite
I am unable to unlock Judgement despite Brutality being just below 80, though I suspect that's because my girls have libido level at least one each.
...unless it's not the scene animation I'm unlocking immediately but a skill I have to use later to unlock said scene...
[UPDATE] Nope, the skill doesn't appear, either.
[UPDATE 2] I've backtracked and beat spite boss with zero libido on both girl. Finally got a message gaining Judgement skill.