(This isnt any existing anime or manga, but the characters have that kind of style, just to make it clear) 22 year old Masuru has just gotten into the FBI. He is placed partners with another guy his age Orochi. Orochi is the complete opposite of Masuru, but somehow, they both need to figure out a way to get along. There was a bombing that just happened a week ago, and is currently getting investigated. On the first day of Masuru's job as an FBI, another bombing occurred. It turns out it was located near Masuru's aunt's house. It was extreme, so even the unexperienced Masuru had to go. As he and his partner were chasing after half of the bombing squad, it turns out they had knives and guns. The squad started to attack the two partners. Masuru was cornered by two of them, but Orochi qucikly saved him using a mixture of multiple martial arts. It turns out Masuru is very into martial arts and now begs Orochi to be his trainer. He finally agrees to the idea. Masuru is now training with Orochi and doesnt know what adventure lies ahead of him...