Tsubasa, a housewife who lives with her husband and father-in-law Osamu. The incident happened during her husband's week-long business trip... When Tsubasa is helping Osamu with meals as usual, she is suddenly hit by a big earthquake, and the door gets stuck and the two are trapped in the room. Osamu gradually loses her physical strength in the heat, and Tsubasa is forced to take care of her father-in-law in every possible way.
