This summer, record-breaking heatwaves have been reported almost daily as abnormal weather, and Rin, who has been living alone since losing her husband, is excited to receive a message from her son saying he is coming home for the first time in several years. Her son seems to be exhausted after being tossed around by the waves of the city... Rin, unable to bear seeing her son dealing with work requests from his company while he is home, embraces him tenderly with her voluptuous body, wanting to help him in any way she can. However, her son ends up thinking of his mother as a woman...