Shu is always in trouble with money but manages to live thanks to the support given by his ex-girlfriend Ayano and the ever-devoted Kisara. The same goes for his job as a PMC. With Ayano's cooperation, Shu won a bidding war at a discounted price to participate in the "D Hazard" prevention operation that occurred in a casino. At the scene of the demon extermination, he planned to rely on Kisara's demonic powers, but she is nowhere to be found due to the money situation ruining her mood. As a last resort, he works with Ayano's leading, major PMC and confronts the Demon, but bit by bit, the battle becomes something suspicious...
We're facing a C-Class! At that price, it's not
even worth killing some D-Class or lower nobody!
نحن نواجه فئة سي! بذلك الثّمن لا يستحق
!الأمر قتل فئة دي أو أقل
Si tratta di un classe C! A quel prezzo, non ne varrebbe
 la pena nemmeno per un classe D o meno.
Esse é um classe C! Por esse preço, eu não
eliminaria nem alguém abaixo da classe D!
Цель — класс С.