A special forces team known as the DA-5 kill off military combat units in an unknown location and get ready to set out to Japan for their next mission, an investigation into the disappearance of two Union members. Meanwhile, Raizel, the protector of the nobles, along with his loyal butler Frankenstein and former Union experiment M-21, continue to spend their days at Ye Ran High School, all while keeping their true identities a secret. M-21 has been assigned to be a security guard for the school in order to pay off his debts of living in Frankenstine's house. During the morning, Frankenstine affirms to Raizel that he had erased the memories of his friends who were involved in their recent incident against members of the Union. The same day, a violent gang barges onto school grounds looking for Yusuke Tashiro, a person involved in the incident with the Union members, one of which broke his arm. The gang is there for an unrelated incident in which Tashiro saved the gang leader's girlfriend from tripping, which angered him. M-21 decides to let go of his fear of being detected and effortlessly takes down the gang's leader, causing them to leave in panic. Later that night, DA-5 arrives in Japan to begin their investigation. Meanwhile, two other unknown people gaze from a rooftop.