Blank Card - Destroyer X Destroyer (Volume 1)

Inspired by light novel Highschool DxD, a 17 years old boy recognises Issei Hyoudou as his Master and aims to be a Harem king. But he is nothing. He is unsociable, isolated, boring and as soon as something gets hard, he gives up. He have no hope in this world until one day his fate changes when he bumps in some people who try to kill him as he is considered a threat to the world due to his powers. What saves him is a team that he can never forget for the rest of his life.