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?
Just restrain yourself enough 
to avoid killing anyone.
.فقط اضبط نفسك ما يكفي لألاّ تقتل أيّ أحد
Hab dich nur so weit im Griff,
dass du niemanden umbringst.
Solo intenta contenerte
para no matar a nadie.
Solo intenta contenerte
para no matar a nadie.
Tant que tu réponds modérément,
sans ôter la vie à personne…
Cerca di misurare la forza che applichi
in modo da non uccidere nessuno.
Tente não matar e controle sua força.
Старайся сдерживать свою силу,
чтобы никого не убить.