Muma no Machi Cornelica...

Based on the erotic doujin game by Dieselmine (ディーゼルマイン). While working at a bar, the protagonist was asked to draw water. Upon picking up a mysterious stone he found there, he was whelmed by light. When he woke up, he finds himself in a country of succubi......! Various types of lewd demons draw near to him. He has to store a certain amount of magic energy...