Dark creatures secretly invaded Tokyo, the devil's city.
Behind the success of the ninja justice called Taimanin, the dark side begins to act...
While there were fatal battles between evil and the champions of evil, Yukikaze, a young Taimanin, begins a dangerous mission to save her mother, Shiranui. Asagi, the leader of the Taimaninas, stands against the plan with a high degree of risk, but Yukikaze uses his willpower and is assigned to deal with Rinko. Both women were still virgins, and wanted to give her to Tattsur, the protagonist. Nevertheless, they were forced to split up before their wish came true...
Yukikaze and Rinko infiltrated the evil city as enslaved brothel candidates. There they learn that a contract to become a whore comes into force with a cruel contract with the devil: a seal on the tongue to prevent any rebellious action! Their body will explode as soon as they take a disobedient step.
There is only one way to stay alive - to become a submissive enslaved prostitute! Yukikaze and Rinko will have to earn money by working as whores and undergoing a terrible lethal contract. In order to save Shiranui, there is no other way but to become a successful priestess of pleasure and make a lot of money. Thus, their humiliating sexual education began under threat of death...
Their life as budding whores begins with the pitiful loss of their virginity. Yukikaze and Rinko assume that their mission will be cancelled as soon as their colleagues find out about the critical situation they are in and give a fake report that denotes them as waitresses in the bar. They must also keep it all a secret from their beloved Tatsura. However, it leads them even further along the edge!
Is there any hope left for these Taimanins in danger!?