Tsubasa, a housewife living with her husband and father-in-law Shu, experiences an incident while her husband is away on a week-long business trip... As usual, Tsubasa is helping Shu with his meals when suddenly a large earthquake strikes, causing the door to jam and trapping the two of them in the room. As Shu gradually loses his strength due to the heat, Tsubasa is forced to take care of her father-in-law in every possible way...