This summer, with record heat waves that are reported as abnormal weather almost every day, Rin, who lost her husband and lives a lonely life, is excited when she receives a call from her son that he will be returning home for the first time in several years. It seems like her son is exhausted after being caught up in the waves of the city...Rin, who couldn't bear to watch her son respond to work requests from the company while she was back home, wanted to help as much as possible with her voluptuous body.