Nagumo is a 27 year old Assassin and a former Spy, He’s probably the strongest member of the Order, The Order is a group consisting of the strongest assassins within Japanese Association of Assassins (JAA). Their task is maintaining the order of the assassin world. Nagumo graduated from The JCC (Japan Clear Creation) which is an academy for assassins 10 years ago, his classmates were Kei Uzuki (Slur), Sakamato, Rion Nagumo, Sakamato and Rion were a trio best friends in CJJ days. 10 years ago Uzuki killed Rion in CJJ for unknown reasons and then got expelled from CJJ, ever since then Nagumo and Sakamato wanted to avenge Rion. Now, Kei Uzuki (Slur) (27) is the leader of a group called X and purpose is destruction of the Order and JAA. Nagumo is on JAA and Orders side but his motives/agenda are unknown, Nagumo has a laidback attitude and constant smile, he’s is easygoing and carefree

He’s an experienced boxer who hangs around the streets as a delinquent, Masaki is labeled as the charisma of the streets. Masaki is a pro-fighter turned street thug. his father left his family, And this made Masaki not want to become like his dad. He wanted to become "strong". And he wanted to keep winning like his father told him to. In his first year of high school he was demolishing 2nd years he just keep on winning and nobody could stop him. This of course made the upperclassmen jealous, and they ganged up on him, After getting jumped he wasn't the same in the boxing, Masaki then decides to hunt down the people who jumped him, one-by-one. He fought all of them In the streets, as he continued to do this, his lost position in the boxing gym, it caused him to him to hang around the wrong crowd and drink. He notices he can't stop being involved violence and he wants to be free, he feels he can't escape violence. And he'll be this way forever, he believes his only way out is death.