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？

<p>"Yellow~!" A sweet voice rang out from behind Baiyi, and a moment later, he felt something warm and supple press against his back; the supple bosom belonged to the Assassin Walker ⁠— the first Voidwalker to heed his call. Her bestie, the Warrior Walker, had given her the Divine Leather suit, which could change its host's physical appearance. </p>

<p>In Baiyi's harem, Lady Assassin Walker's facial features could not be called the best, but the Voidwalker was still as cute as a button. The fey-like charm and siren-like beauty of the Fairy Walker and the Warrior Walker was the reason why Lady Assassin Walker could not be considered number one in the appearance department. Amongst the female Voidwalkers, Lady Assassin Walker was not the most powerful, neither was she the most docile. In these aspects, she also paled in comparison to the Fairy Walker and the Warrior Walker. </p>

A Different Kind of Meeting Between the Voidwalkers