Tsubasa is a housewife who lives with her husband and father-in-law, Osamu. The incident occurred during her husband's week-long business trip... While Tsubasa was helping Osamu eat his meal as usual, a big earthquake suddenly hit the house, and the door was not properly installed, trapping the two of them in the room. As Osamu's strength gradually wanes from the heat, Tsubasa is forced to take care of her father-in-law by any means possible...