Sixteenth Basket of Mantaos

Imagine being forced to live, after death, as incorporeal bodies trapped in a vast space of nothingness for thousands of years, with nothing to do but exchanging past memories with other cohabitants (read: weirdos).  Everybody wanted out, but there was no way to leave the Void... 
Until one day, a young man was finally summoned, as a powerful but reluctant mentor, by a bubbly and motivated but completely naive young girl. Baiyi, finally out of the Void, was the only one who could save all of the other 32 souls from their prison and his summoner might just be The Key to their freedom.
However, Baiyi had to use the techniques and abilities the other souls had taught him throughout the years, and together with his own extensive knowledge of anime and game tropes from his shady and dangerous past as an otaku, to face the biggest challenge of them all: training the clumsy young girl he was forced to partner up with… into a competent sorcerer!

EndlessFantasy Translation 

Why Did You Summon Me？

Baiyi never once thought that his plan would be actualized without setbacks. Shaking up the belief that had taken root in the hearts of many, was always going to be difficult. Changing the world's perspective was not only the thing he had to do.

The powerful beings running the world from behind the scenes — some of who were present at the conference — feared the rise of someone even more powerful than they are. Mavericks like Hope made them feel as though they were walking on eggshells. From what they had heard, Hope was ranked fifth amongst the Voidwalker; this meant that there were four Voidwalkers much more powerful than he was!

If these Voidwalkers, whose powers were said to exceed the imagination of most, were allowed to venture into the real world, a chaotic shake-up of power would be the least of their worries. The released Voidwalkers may very well lead a revolution against them, the ruling class.

The Tale of A Promising Student