"It has something to do with her left eye, the one that she has some kind of cloth covering it. I remember her being more positive and friendly, but she's almost the complete opposite now. Ever since she had that eye of hers infected with darkness, she's basically a person using Spiritual powers as well as Demonic powers. The only way to make sure she doesn't go berserk with those demonic powers, she wears that enchanted cloth to nullify the corruption in her eye, but if she removes that, then she goes into that berserk animalistic state," Takahisa was pretty keen on Corentine's corrupted state.
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Kaika wasn't bothered by her door closing, only continuing to snore loudly.