Set in wartime Osaka, the novel follows Mizeko Nakase, a military officer's daughter who marries into the Omari family and is drawn into a series of tragedies. It blends the atmosphere of a merchant household with the shadows of war in a full-length classic mystery.

On the eve of the Osaka air raid, a daughter-in-law in a merchant family faces tragedy after tragedy.

Araki Murashige, trapped in Arioka Castle, asks the captive Kuroda Kanbei to solve the strange incidents inside the fortress. It is a sharp historical mystery that fuses a siege in the Sengoku era with classical deduction.

In a castle at war, only strategy can reach the truth.

Six students who survive the final stage of a job-hunting interview are forced to confront one another's lies and sins in a sealed-off discussion room. The dialogue-driven structure keeps overturning what readers think they know about each character.

In the job interview room, the six candidates are stripped of their truths and lies.

A string of murders breaks out in the rain-soaked Aomikan, drawing a boy who has come to see a famous detective into the heart of the case. It is a classic closed-circle mystery driven by logic and escalating tension.

In a mansion on the brink of being swallowed by floodwaters, an inescapable mystery begins.

A headless corpse found in a depopulated village sets off a confrontation between a terrorist advocating regional abandonment and the officials opposing him. The novel combines a contemporary local-government crisis with an impossible crime puzzle.

A threat made in the name of salvation exposes the harsh reality of the regions.