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？

Paimon the giant energy being stared at his severed hand in disbelief. For a moment, Paimon's expression was unreadable, as a wave of emotions flooded his mind. He could freely regenerate any body part of the giant energy being, so the wound could not be considered fatal.

It was the shock of watching his hand get severed that left him stupefied.

Sharkie lunged forward and quickly swallowed the severed hand.

Paimon turned his head slowly, but he had recovered from his shock. The stump on his wrist glowed brightly, and a new hand grew out from it. "A wasted effort. Our sacrifice outweighs your futile struggle."

Archangel Baal frowned and quickly transformed into another giant energy being. The giant energy beings stood on both sides of their floating island, looking down at the island as they prepared their killing strike.

He Returns