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I was thinking about the girl's weight and I realized that Miia's bed must be an industrial-level reinforced bedframe, since she weights near a half ton. And since Cerea has hooves and weights more than a half ton she musn't be able to walk in every room of the house (I remember seeing wooden floors in some pics), unless they changed it into some kind of hard wood.
And since her room has tatami floors, wouldn't she ruin them with her weight?