Many of the novels of Japanese author Kobo Abe have been concerned with the question of identity and survival. The main character of "The Woman in the Dunes" has to change his sense of identity in order to cope with living in a sand pit.
In Abe's latest book. "The Ark Sakura," an obese man who goes by the name of Pig or (preferably) Mole has constructed a kind of "ark" which is actually a nuclear shelter he has built out of an abandoned underground rock quarry. He is faced with the problem of whom to select as his crew, but circumstances eventually dictate the selection of crew members: a sakura , and an insect dealer, among others. ( Sakura means "shill," in this case one who is hired by stores to buy merchandise in order to entice customers into buying.)
Mole's ark is not as secure as he thought; he comes into conflict with the Broom Brigade, a neo-militarist group of senior citizens, which prefers to select survivors of a future nuclear war through fascistic means. Originally, Mole much preferred to be alone, sitting on a toilet in the rock quarry, and so, as others are drawn into his world and disrupt it, he is increasingly drawn to the world outside the quarry.