The Cage - Darklight of a Murder.

Yukiko endures a difficult life to protect her younger brother who has myeloid leukemia, and the only thing that gives her emotional support is her boyfriend Goro. However, Goro accidentally kills a man who comes to Yukiko's house to collect a debt. Five years later, Yukiko has become the wife of businessman Hasegawa Masashi, much older than her, to pay for her younger brother's medical expenses. However, their married life is a hellish one, enduring abuse and humiliation every day. Meanwhile, Yukiko is reunited with Goro, who has completed his sentence...