Feeling unhappy with his gun, Jigen is looking for the world’s best gunsmith. He finally finds out that Chiharu, who runs a watch shop, is the person he’s been seeking. Then, Jigen meets Oto, who comes to Chiharu’s shop looking for a gun. Jigen finds out about Oto's secrets and the mysterious organization that’s after her. After Oto is kidnapped, Jigen gets into a desperate battle to save her.

During the Sengoku period, villagers brutally killed eight samurai, and in the Taisho era, the head of an old family murdered 32 villagers in the Eight-Tomb Village. Terada Tatsuya, who had long been estranged from the Terada family, returns as its successor. However, this return is the beginning of a tragedy. Grandfather, half-brother, monks, nuns... one after another, people related to the family are murdered. Yet, the truth remains elusive. In the midst of this, Tatsuya stumbles into a massive cave system. What he sees there is a wax figure of the head of the Terada family wearing the samurai armor. Meanwhile, Kindaichi, who has uncovered the secret of Tatsuya's birth, finds himself at the same cave. At that very moment, Tatsuya is cornered deep within the cave by villagers who fear the curse.

A young reporter is covering the mysterious case of a child found dead with missing internal organs.

Akako, a shape-shifting goldfish in the form of a coquettish nymphet clad in diaphanous red dresses, naively plays the role of erotic muse and adoring pet for an aging writer seeking greatness. Things quickly get complicated for the odd couple, however, when the writer's deceased former student/lover enters the picture as a ghost and helps Akako realize her own desires, activating her agency and frustrating the one-sided male fantasy the writer is so keen to continue.