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Kiara thinks management is fucking stupid for putting so much focus on the lore (especially when not even EN2 themselves understand it), and thinks the powerlevels of their lore is dumb, because they've went from 'here's a cute girl who plays games' to 'here are metaphysical concepts given human form, and here is their manager, who is literally fucking God'. She doesn't actually hate EN2 themselves.
You can maybe cobble together a rrat about Kiara not liking IRyS, but even THAT is because of management. Announcing a vsinger (which is basically just a vtuber who doesn't have to pay to get songs) on the same day somebody released a song (that they DID pay for) is a pretty fucking big dick move, and the fact that that day was ALSO their birthday is just the middle finger on top. Obviously that isn't IRyS' fault, and I'm sure Kiara knows that, but I can definitely understand if there's some feelings of resentment there.