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?
Is that the right job for guys like us, 
who specialize in large-scale combat?
،أهذه مهمّة تناسبنا نحن
المتخصّصون في القتال واسع المدى؟
Unsere Spezialität ist das Schlachtgetümmel.
Gibt’s da keine anderen?
¿Eso es trabajo para unos expertos
en combate como nosotros?
¿Eso es trabajo para unos expertos
en combate como nosotros?
C’est vraiment un job pour nous,
des spécialistes du combat ?
ti sembra una missione da dare a noi,
che siamo specializzati nel combattimento?
Ведь мы специалисты
по крупномасштабным боевым действиям.