Yukikaze
OVA code and the same novel, this manga from six chapters gives us a deeper idea of the prehistory Rey Fukai, James Bukhara, Tomagavka John and other FAF members. The past and the attitudes of the characters seem to be deviated from the sequence of events, as can be seen in anime. Therefore, this manga should be read only after you first looked at anime or read the novel, and it should be considered as a kind of alternative story.