During a sweltering midsummer heatwave, Azusa Hirose reunites with her former university professor, Nakata, after many years. He once harbored secret feelings for her when she was his brilliant student. When he asks for her help with his latest book, she begins visiting his home regularly. As they spend more time together under the same roof, their emotional distance gradually closes. Sweat trickles down her cheeks, dampens her chest, and coats her body, reawakening Nakata's long-suppressed desire. The warm, humid air intensifies the growing tension between them, drawing them into a passionate, forbidden affair.