主人公・一橋桐子（松坂慶子）は、哀しみの淵（ふち）に沈んでいた。年金とバイト収入で暮らしも楽ではない中、唯一の希望であった親友が病で亡くなり、毎日が突然空虚な日々となったのだ。そんなとき、テレビで見たある逮捕者の「この世に未練はなかった。刑務所に入りたくてやった」という供述に心を奪われた桐子は、終（つい）のすみかを「刑務所」に設定。できるだけ人に迷惑をかけずに逮捕される方法を模索しはじめる…。
"The place Kiriko sought to be her final abode was prison..." ― A hilarious yet poignant account of a lonesome woman's quest for comfort in her old age ―
Kiriko was in deep despair. Amidst her barely manageable life relying on her meager pension and part-time income, her best friend and sole source of consolation had just died, and she was suddenly facing days of emptiness. Then one day she sees on TV a man arrested for theft claiming that he had nothing left to hope for in his life, and that he had committed his crime for the purpose of going to prison. Inspired by this thought, she sets prison as her final home, and begins to search for ways to get arrested with the least amount of trouble caused to other people.
