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 had only realized his mistake after allowing the Hitman to leave—why did his brain stop working at that very moment enough for him to agree to the Hitman's volunteering? Fine, so the dude had changed into a suit that could blend with their surroundings, but he was still the Hitman. That changed nothing at all!

The others said nothing after he left, because some conclusions could be made without ever saying it out loud with others. The Blacksmith, for his part, already scouted a mound tall enough for him to set up his heavy machine gun; The Lich was already fine-tuning his recently green-ified Saint Quartz Staff; the Scholar had produced heaps and heaps of scrolls from her own storage pouch as she muttered to herself on which to use and for what and when; And finally, Lady Assassin stood and… grinned like an idiot at Baiyi.

First Encounter