Hazuki and Tsukasa, senior investigators at the Kanto Drug Enforcement Bureau, have hated sexual crimes since childhood, influenced by their father, who was a senior official at the bureau. Meanwhile, Hazuki, the older sister, is arrested during an investigation into the Moriyama-gumi group, which distributes illegal sexual substances on the streets... Tsukasa, the younger sister, sets out alone to rescue her sister, but they are caught in a trap and both are taken prisoner. Ironically, it is the first time that a powerful aphrodisiac sexual substance is injected into their bodies, revealing their hidden masochistic nature... They resist with their trained minds and bodies, but what will become of Hazuki and Tsukasa, the investigators say...