Morito Hayama is the main protagonist. As a trainee at the academy, Morita is given the task to protect Kotonoha Nanase, a special target whose Language Grave has became grave threat to the world. But hidden inside his adolescent body is a veteran mercenary, the Master Rank Mercenary, that is rumored to be one of the strongest mercenary, if not the strongest, in the world. Specialized with his veteran mercenary skills (survival and martial arts) and his tough vitality, Morita survived many wars and assassinations. That is until the arrival of Kotonoha, his subject to be protected,who he vowed to protect at any cost. Morito's your is average short student, with short hair and a baby face is considered cute by many peers. Behind his adolescent look, Morito is actually a veteran mercenary with many scars around his body which only his underlings (especially Elena) understand. His scars mostly comes from the wars he has experienced from the past, during his role in the Child Room from overseas. In his innocent persona, Morito can be tend to be friendly to anyone he knows, particular the Saiga Sisters who he has know since childhood (who are among those who never know his secrets). In this innocent persona, Morita is also shy and easily outspoken by some of his peers due to his shyness and his "no rank" student. In his persona, this Morita would try to befriends with everyone around him.