In the midst of a terrorist attack that kills all his classmates,Tohru
Kuroe knows the chances of seeing yet another woman die makes Tohru pick
up an abandoned gun - The beast awakens; taking over. When Tohru comes
to his senses, he finds he is now a killer. Finding out he was
genetically engineered to be a killer, his codename is D-17, Tohru
continues his 'normal' life amidst challengers threatening his life and
those around him.