The neighbor's wife hanging socks to dry on her balcony in the afternoon is a sign that her husband is not home. (Kuroshima Rei, SONE-669)

(Someone hung their underwear on the balcony again today. That's a signal we're going to make love.) Newlywed Rei, though sexually frustrated, felt suffocated in her conservative husband's relationship. One day, Nakata, a middle-aged single man, moved next door. He met Rei, and her desires gradually began to be released. Rei secretly hung her underwear on the balcony as a signal, and the two began a secret affair. She used the excuse of repairing the air conditioner to invite him into her room, and they met repeatedly when her husband wasn't home. Rei became increasingly bold.