A boy, Yuuki and Yuki, who were assigned as hunters to the "Breathless" organization "STAB" in the wake of an incident caused by an unidentified monster "Breathless". The two people open their hearts little by little while suffering from each other, but the situation, the position, and the enemy do not allow peaceful days. What is the identity and purpose of the terrifying enemy? What is the secret of the mysterious beautiful girl Bennetnersh? Volume 2 of hard and dark action that approaches the core of the story.