Middle schooler Seigi, skilled in martial arts, has an instinctual need to protect the vulnerable. One day, he comes to the defense of a homeless man against a group of troublemakers, and in gratitude, the man marks his palm with an enigmatic tattoo. This tattoo is a classified weapon developed during the arms race between the Serinistan Kingdom and America.
Seigi's life takes a perilous turn when an influential girl, who also bears the same tattoo, viciously pursues him to obtain his. Despite his martial arts proficiency, Seigi is in danger. Can he unlock the full potential of his tattoo in time before it's too late?
