Kara no Naka no Kotori / Maiden's Diary

Hentai is based on the visual novel of the same name by the studio "Black Package", which was released for sale in 1996. This series is a prequel to "Hinadori no Saezuri".

The main character of the hentai is a young revolutionary named Foster, who spent his days as if in paradise. Money and wine flowed like a river, and young sexy girls from all over Europe swirled at his feet. However, this carefree time did not last long, and Foster failed and became poor and disgraced. Dread Burton, an influential businessman and owner of a railroad, hires him as a sex instructor. Foster is obliged to teach extra-class prostitutes for Mr. Burton. Every day, more and more girls came to his house. Clumsy Lisa, impatient Aya, innocent Ren, and noble Claire - they all must undergo sex training to satisfy Mr. Burton's enormous sexual ambitions...