Uq Holder 16

The hit shonen adventure continues, into the far future, beyond the finale of Negima! Tota, a boy with a magical and mysterious pedigree, joins a team of immortals to fulfill his dream and reach the top of the great orbital tower, extending from Neo-Tokyo into the unknown reaches of space! But soon he finds himself embroiled in a power struggle that spans generations and will determine the fate of a planet.