That was a good read, I enjoyed how much of a best girl Eiria was.
>Kumika's race
Although with a good deal of handwaving, I like to pair Kumika's transition to a wildly (un)common diet and head tentacle powers as related: while she was more deadpan than her normal until The Udon struck, it seems her species keeps their emotions relative to their intake as seen in behaviors on her planet: the mother and her baby, the audience to the 'exchange expo' and the peeks at her household show few expressions, and when they happen the 'expressions' don't travel beyond shoulder length. Yes, the flight and booze-berserk throws this out together with the author unabashedly changing designs on the fly for better expression.