It's about a guy named Klain having vivid dreams about another guy named sora's situation at 17. He kept thinking about it not knowing it is hinted that they will meet someday, meanwhile Sora has a purpose with Klain he is tasked by his master to protect him as her only favor for training him since to become stronger, since Klain is Targeted by the BVC Organization for an experiment. as a BVC member and the right hand man of the chairman in the organization he is forced to leave not knowing it will cause greater destruction making the war against organizations and the monsters created by the BVC Organization to grow worse instead of going back he is tend to fight with the TDA Organization against the BVC Organization.