"The Twilight Years" is a poignant story revolving around the life of a middle-aged woman who is burdened with the responsibility of taking care of her ageing and ailing father-in-law while trying to balance her work and personal life. The novel explores the themes of old age, family responsibilities, societal expectations, and the struggles of women in a patriarchal society. It offers a critical examination of the social, cultural, and personal issues related to aging and care-giving in post-war Japan.

The book follows the harrowing journey of two boys abandoned at birth in a Tokyo train station locker, who grow up in an orphanage together and form a deep bond. As they navigate a dystopian underworld filled with violence and decay, the boys, now teenagers, embark on a quest for revenge against the mothers who left them and the society that neglected them. Their search for identity and belonging takes them through a surreal landscape of urban chaos, where their shared trauma and desperation for meaning lead them down a destructive path, challenging the reader with themes of abandonment, survival, and the human capacity for both love and brutality.