Raizel, 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 while keeping their true identities secret. They were living their lives as normal until one day, when a violent gang barges onto the school grounds. M-21 is forced to make a choice in order to protect the students. Meanwhile, DA-5, a mysterious special forces team, is dispatched to Japan on an investigative mission. What will become of the trio's peaceful new life?

Rael arrives at Ye Ran High School to collect Seira per the Lord's order, but he encounters M-12, Tao, and Takio there, and a fight breaks out. Who is this man suddenly confronting the three of them? Seira tries to persuade Rael to leave, but Rael continues to do as he pleases. And for the sake of protecting Raizel, Frankenstein can't just stand by and watch all this carry on...