After his wife dies, the senile father-in-law Shigezo recognizes and clings only to his son's wife Akiko, not his own son, so she absorbs his care while still holding her job. The family's men and the social institutions around her treat his care as her natural obligation rather than a shared burden.
The formerly stern, respected patriarch is reduced by dementia to a being who wanders, hoards food, and fails to recognize his own son, inverting the household hierarchy. The book shows that the reverence a family owed an elder evaporates as the person requiring the most care becomes the one holding the least standing.
Akiko's caregiving is layered on top of her paid employment and housework, consuming her nights and savings while remaining economically uncounted and socially unacknowledged. The labor is real and exhausting yet registers nowhere in wages, recognition, or the family's sense of who is doing the work.
The book views Japan's demographic aging not as statistics but through a single family discovering there is almost no public infrastructure, limited nursing options, and little guidance for dementia care. Framing the crisis at household scale reveals that an unprepared society quietly offloads its aging problem onto individual, mostly female, relatives.