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Kronii is mentally depressive. She wants to be with people but people are turned away by her depressive mood, which in turn makes her feel more depressed. Mumei and Bae both have the ability to brighten her mood and are not dragged down by her depressiveness, which is why you can see her enjoying herself much much more and doesn’t go full low energy.
Bae and Mumei makes Kronii a happy girl