UQ Holder!

UQ Holder! (ユーキュー ホルダー) is a Japanese manga written and illustrated by Ken Akamatsu, published by Kodansha's Weekly Shōnen Magazine from 2013 to 2016, where the serialization passed onto Bessatsu Shōnen Magazine at present. The series is a sequel to his main series, Mahou Sensei Negima.

Plot
For two years, Touta Konoe lived with no other relatives after the death of his parents, only to be raised by this teacher and foster guardian, Yukihime. One day, Touta became mortally wounded by a bounty hunter claiming after Yukihime's life, but to discover he was resurrected as a vampire by Yukihime, who is actually the legendary vampire mage, Evangeline A.K. McDowell. Upon fending off the bounty hunter and his reawakening, Touta and Yukihime journey off to the city of Shin-Tokyo where Yukihime leads a secret society of immortals called UQ Holder. Touta joins UQ Holder while he trains to become stronger as this grandfather, the legendary Negi Springfield, while being the central target between 3 conflicting factions comprised of Negi's allies in the past. A conflict that resolves to save the world while in search of liberating the legendary hero from an eternal loop of fate

Other Sources

 * (Manga)
 * (Anime)