Hentai "Kornelyuk, a city of Succubi" is based on the eponymous game from the Studio Dieselmine released in 2017. 

The main character of the story had too much in a local bar and passed out. He awoke from a strange radiance, had a strange stone in his hands and sexy succubi roaming about. He's in succubus land! To return it needs to give enough power(semen) to the succubus. Will he be able to return or will he remain a sex slave for the rest of his life?

 

Added subtitles on 4 EP