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Couple of translator notes.
The 'emotion' the Frontier girls brought up is 喜怒哀楽 (kidoairaku), a compound of kanji for joy, anger, pathos, and humor. Each etude represented one of them, in order.
In anger, the term for 'two parties that don't get along' was 犬猿の仲 (kenen no naka), literally 'the relationship between dogs and monkeys.'

I don't own anything woohoo~
Thanks asianJ for proofing.
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-Fly