I ended up taking care of my younger childhood friend, Rikka, for five days while her parents went on a trip. Since our parents are close, she started staying at my place, beginning our cohabitation life. Though Rikka acts cold toward me, she unexpectedly shows a different side—slipping into my bed because she's scared to sleep alone, or insisting on joining me in the bath while wearing her school swimsuit because she's afraid and embarrassed to close her eyes. Behind her aloof attitude, she might actually have strong feelings for me. Our daily life together, filled with erotic tension, gradually nurtures budding romance. Experience, from a first-person perspective, the start of this intimate cohabitation with Rikka!