Late 20th century, during a time of rampant social corruption, a criminal market in human sex slavery has become increasingly common. The Japanese government created a specially trained task force to combat these crimes.

Those who are at the top of a zaibatsu, a large Japanese business conglomerate, tend to have eccentric tastes. For one particular executive, his hobby of choice is spending his fortune on women, buying sex slaves naturally. At his luxurious mansion in the most remote of locations, he spends his time training his pets far from prying eyes. An acquaintance of his shares the same pastime, and the two one day decide to compete to see who can train the best sexual servants. At the same time, an amnesiac young lady shows up at the doorstep, not realizing what awaits as the game begins.

Based on the erotic game by Marine.
After a long absence, Shunsuke returns home at the invitation of his older sisters. He learns that his sisters suffer from a rare condition: they have abnormally strong sexual desires resulting from a disease. Now, Shunsuke must do whatever he can to improve their health.

Hoping that she was finished being taken advantage of she resolved herself to stand up to her uncle and have him delete the photo.
He gives in and deletes it after she asks and just when she thinks she is free he shows her all the other ones he has. The abuse continues and she can’t get the smell of a man out of her head and she finds herself doing lewd things in public not caring who sees.

Bonus section for Hachishaku 2!

It began centuries ago, when the Miroku ninja clan made a deal with the forces of the underworld, leading to centuries of struggle between rival clans. And now, after more than 600 years of peace, the denizens of the underworld are about to get a new boss.
Now, 18-year-old ninja in training Midou Miko is entrusted with the family business: making sure that sex-starved demons stay out of humanity’s way! What does a ninja do? Fight, with every battle skill and sexual sorcery she can muster!

Nanase’s father has just been arrested for murder. While his guilt remains in question, a perverted gang of Nanase’s classmates have already passed judgment, and are punishing her for her father’s crimes. To atone for his sins, she must obey their every sexual command to satisfy their twisted desires. At school, in her room, and even on a crowded train. No matter where they are, Nanase must pleasure them in any way possible. But not all of Nanase’s classmates can be so easily satiated. Someone’s publishing very detailed articles about her nightly lustful escapades in a special Atonement Newspaper! Spread across campus, this public humiliation might just be worse than her nightly tortures!

The end of the Heian Era. Shaga saved the orphan, Yoshitsune, on a whim and has taken care of him ever since. Avoiding the men dispatched by the Taira family, Shaga and Yoshitsune head for Hiraizumi, where they discover a new part of themselves.
10/11/2020 – Updated to the Director’s Cut version with additional scenes.