UQ Holder Vol 1

UQ Holder Vol 1 by Ken Akamatsu. An Action manga rated Older Teen, published in English by Kodansha in 2014.

Set in the world of Negima!, UQ Holder follows Tota Konoe, a boy from the countryside who becomes an immortal vampire after a fateful encounter. He joins UQ Holder, a secret organization of immortals, and sets out for the giant space elevator tower in Tokyo.