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?
No. Our mission this time 
isn't fighting. It's investigation.
.كلاّ. لا تقضي مهمّتنا هذه المرّة بالقتال. بل التّحرّي
Nein, unsere Mission ist kein Kampfeinsatz.
Es geht um Informationsbeschaffung.
No. Nuestra misión no es pelear,
solo investigar.
No. Nuestra misión no es pelear,
solo investigar.
Non. Nous ne sommes pas ici
pour nous battre, mais pour enquêter.
No. Questa non è una missione
di combattimento, ma di ricerca.
Esta missão não é de batalha,
e sim de investigação.
Нет. На этот раз у нас не боевое,
а разведывательное задание.