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 swamped by the waves of the city...Rin, who can't stand watching her son respond to work requests from the company while she's back home, gently hugs him with her voluptuous body, hoping to be of some help even in the slightest. - Ta. - However, as expected, the son ends up thinking of his mother as a woman...