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 bald guy's haughty expression softened as soon as his mind registered their words. Staring at the guidebook in his hand, he asked tentatively, "Sae everything in this book… they're all untruths?"

"Oh no, they're accurate, alright. In fact, I bet everything in that book is true. Still doesn't warrant spending a dime for it," the hunky student replied.

"True that. You can get practically the same kind of information from the book just by asking any senior in the faculty. Hell, treat them with a drink or something, and they will tell you everything, free of charge. Pay attention to what they say and you, too, can author a book like that!" The shorter Southerner chimed in. "Oh, I'd wager that was exactly how that Business Faculty bastard compiled this overpriced guidebook in the first place."

So Ambitious!