Hmm, something funny happens if you try google translate '緋宵' -Akeyoi- (Scarlet Evening). Google will give you "Hangover". I'm not aware if this a new word or something in the latest revision of Japanese Dictionary lol
But, this could explain why Houki is "indulge/drown" with power. Or it's just a pun to Houki being drunk at the end of volume 7.
Or may be Houki been dancing to the wrong dance her whole life that made the 'tsun' part of her personality
