The renowned old family, the Eto Family. The Eto Family holds a succession ceremony every 12 years to determine the new head of the family. The current head, Mamuji, summoned his clan. Mamuji's second son, Injin (deceased), and his wife Kasumi Kaho, along with their daughter Mai (Ohizuki Hibiki), also gathered. Mai recommended her mother, Kasumi, to become the new head, but Mamuji and his eldest son, Gyosaku, blocked them with a lewd trap. Following Mamuji's schemes, the mother and daughter awaken to pleasure and fall into being female prostitutes. The secret behind Mai's birth is also revealed…
