Hikimori attempts to safeguard the Haibara mansion from his cousin Reina and her mother, Shiho, by using blackmail to seduce the latter. During their encounters, Shiho reveals a shocking family secret regarding Hikimori's incestuous parentage and the dark history of the estate. After a violent turn of events leads to the death of the family patriarch and the arrest of Reina's fiancé, the inheritance shifts, leaving Shiho in control and Hikimori under her devoted care.