Mi-da-ra / Mi-da-ra

Hentai anime adaptation of the visual novel of the same name from studio Mink. 

One day, the main character of the hentai, Yuto-kun, was wandering the back alleys late in the evening when he unexpectedly collided with some stranger and lost consciousness. When he came to, he realized that the girl had dropped a videotape. Yuto quickly got his bearings and took it for himself, and upon arriving home, he discovered on the recording that he had sexually abused his own sister, Yumi. Shocked by what he saw, he called his sister and showed her the video. Yumi saw her sexual fantasies come to life on the videotape...