MIDV-230 Living together for five days with a haughty childhood friend and junior, Nana Yagi

I have a younger childhood friend. Our parents are close, and while they're on a five-day trip, I'm supposed to take care of my childhood friend Nana. She acts cold but comes into my bed because she's scared to sleep alone, and she even takes baths with me in her swimsuit because she's afraid and embarrassed to bathe alone. She's feisty and bratty, but I can't hate her! Is she doing lewd things while acting tsundere as a reverse expression of her affection? Here's the tsundere cohabitation life delivered through first-person perspective!