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?
I think I now understand why 
you decided to let him stay here.
.أظنّني فهمتُ الآن لِمَ قرّرت أن تدعه يبقى هنا
Ich verstehe langsam, warum Ihr
entschieden habt, ihn bleiben zu lassen.
Creo que comprendo por qué
decidiste dejar que se quedara aquí.
Creo que comprendo por qué
decidiste dejar que se quedara aquí.
Je commence à comprendre
pourquoi vous avez décidé
Credo di aver capito perché
ha deciso di tenerlo qui, padrone.
Sinto que entendi porque
quis acolhê-lo aqui.
Кажется, я начал понимать,
почему вы решили оставить его здесь.