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？

With Lady Assassin Walker's masking techniques, Baiyi's group reached the black castle undetected. They planned to go around a group of skeleton knights that were in front of the castle, playing a game that vividly resembled soccer.

Since the senses of skeletons are impaired, unlike humans, it was nigh impossible for this group to see through the Assassin Walker's techniques. Hence, the Voidwalkers crept, one after the other, past the playing skeletons. Everything went smoothly until the Hitman Walker's turn.

He had only taken a few steps forward before a skull, which was being used by the skeletons as a soccer ball, struck the Hitman Walker's body and bounced off.

Facing the others, the Hitman Walker helplessly spread his arms open, wearing an expression that said, "Guys, I think I effed up." Two polearms suddenly appeared in his hands, and he used them to slay the skeletons he had been trying to flank.

A Terrifying Enemy