Kai is a shy tenant in a bustling apartment complex who develops a hidden voyeuristic fixation on his beautiful neighbor, Ikenaga. From behind his curtains, he regularly spies on her as she strips down and pleasures herself, turning those private moments into his daily source of arousal. A chance encounter one morning leads to an unforgettable night of heated passion. Kai now finds himself reflecting on how his secret obsession has evolved into steamy, physical intimacy.