In the dark corners of a 1920s metropolis where wealth and poverty, dreams and despair all coalesce, a boy named Sangha lives humbly with his beloved little sister. Their fragile happiness is soon shattered by the iron fist of the mafia that rules over the city. Sangha is left broken, sinking into the depths of despair, until someone reaches out to him: a man with a carefree, frivolous smile who calls himself Shinku, a member of the criminal underworld.

The story takes place in Procanac, one of the largest cities in the United States during the Prohibition era. As a boy working at a bar before the enforcement of alcohol bans, Sangha struggles to maintain a peaceful existence with the only family he has left. After a devastating encounter with the mafia shatters his world, leaving him with nothing, Sangha accepts Shinkus offer and joins an organization known as the White Snake Hall. Working under Shinku, Sangha becomes involved in various tasks for the syndicate, gradually being pulled deeper into the citys criminal underbelly. As he navigates this dangerous new life, he finds himself tempted by the darkness that has taken root in the metropolitan shadows. The central question driving the narrative is whether this path will lead Sangha to salvation or to complete damnation.

The main character is Sangha, a young man whose devotion to his sister defines his initial innocence and whose subsequent loss propels him into a desperate search for meaning or revenge. Shinku is the enigmatic figure who recruits Sangha, his carefree smile belying his dangerous role within the mafia hierarchy. The narrative arc follows Sanghas transformation from a humble, hardworking boy into someone shaped by organized crime, exploring themes of fraternal love, despair, and the loss of innocence against the backdrop of a gritty historical period. The light novel is noted to be a dark fantasy work inspired by the song SHANTI.