[Reducing Mosaic]MIDE-937 Living together for five days with a conceited childhood friend and junior, Rokka Ono

I have a younger childhood friend. Our parents are close, and while they're on a five-day trip, I'm in charge of taking care of my childhood friend, Rikka. She acts cold but comes into my bed because she's scared to sleep alone, and she even takes a bath with me wearing her swimwear because she's afraid to close her eyes and feels embarrassed. Rikka is bratty but impossible to hate! Is she doing lewd things while acting tsundere as a reverse of her affection? Here's the tsundere cohabitation life delivered in first-person perspective!