Devil 17 – Hokago No Kusenshi

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.