Instant Bullet

is a Japanese manga series written and illustrated by Aka Akasaka. The manga was serialized in the Dengeki Daioh magazine and published in Japan by ASCII Media Works under the Dengeki Comics NEXT imprint from March 2014.

Synopsis
Everything in this world is my enemy. This kind of world is worthless. A boy, who is called a demon with no human heart, breathes, lives and imagines. But what is the pounding in his heart when he heard he is going to save the world? That’s not his wish, though…

(Source: Manga Updates)