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？

The moment Baiyi stepped onto the castle's grounds, the dark-skinned loli controlled her Berserker to use its Noble Phantasm to dole out a swift, lethal attack at him. The dark-skinned loli watched with glee as the bolts of green lightning destroyed the intruder's body before converging into a gigantic pillar of blinding light. This was the final stroke of her Berserker's Noble Phantasm.

"Ha!" The dark-skinned loli exclaimed haughtily. "Who called him a 'powerful and mysterious' magician? Faced with the power of my Berserker, all he could do was die! Victory in this Holy Grail war is ours, without a doubt!"

Out of habit, the dark-skinned loli spread her arms open to hug her Servant, but when her arms were inches away from the skin of the Servant, the dark-skinned loli lept backward. She looked as though she had just received a mild electric shock even without skin contact.

"Gah, it burns!" The dark-skinned loli yelled.

Five Days Since Arrival