I have a childhood friend who is younger than me. Our parents are close, so I've decided to look after my childhood friend Reina for five days while both of our parents are away on a trip. Although she has a cold attitude, she gets into my bed because she's scared to sleep alone, and she also joins me in the bath in her school swimsuit because she's scared and embarrassed to be alone. Reina is competitive and cheeky, but you can't hate her, and she keeps toying with me! Is her naughty behavior while acting tough a sign of her affection? A subjective video of a tsundere cohabitation life!