Code:Breaker

Code:Breaker (コード：ブレイカー, Kōdo:Burēkā) is a manga created by mangaka Akimine Kamijyo running in Weekly Shōnen Magazine through Kodansha. It tells the story of a high-school girl who is trained in martial arts and a new transfer student, a boy with mysterious powers.

Story
Riding the bus one day, Sakurakouji Sakura looks out the window to see people being burned alive with a blue fire and a boy her age who's unharmed and standing over the people. She comes back to the site the next day and there are no corpses or evidence of any kind of murder, just a small fire. She then goes to class to find there's a new transfer student who looks exactly like the boy she saw before and wears a black glove only on his left hand. Later she finds out that he is the sixth "Code:Breaker", a special type of assassin with a strange ability, who is only a member of a secret organization that serves the government.