Tomoe serves as a primary investigator within the Mikagura Detective Agency, characterized as a dedicated student who deeply admired director Tokito Mikagura. Following Tokito's unexplained disappearance during an incident in China, Tomoe traveled to a foreign country accompanied by fellow students Shigeno and Chizuru after learning Shigeno's elder brother had reportedly sighted Tokito at a church. Upon reaching the church, the group discovered the mutilated corpse of a priest with severed arms. Tomoe interpreted this grisly scene as a potential connection to Tokito's vanishing and actively engaged in the subsequent investigation to uncover ties between the priest's death and Tokito's whereabouts. This narrative unfolds during the Taisho era and integrates elements of mystery and erotica.