Shiori, a senior at university, is invited by Nanako on a hot spring trip. By chance, they meet again at the hot spring inn where they're both staying and encounter Furuya, whom Nanako had a crush on during their student days. The free-spirited and passionate Nanako finds her feelings for Furuya rekindled, but Furuya instantly falls for Shiori. Between the two women, past emotions and new desires become entangled.