Velvet Echo

Junichi's father was a scientist studying paranormal activities. He unexpectedly passes away, leaving Junichi all alone. Junichi is really depressed, but one day, a demon suddenly appears. This demon promised his father that she would take care of Junichi.

Her name is Celena. She brings her two extremely sexy daughters along. They barge their way in and begin living with Junichi. No matter how pretty they are, the fact is: they are devils, and devils perform demonic acts. How is this going affect Junichi's normal life?

Runa is deeply interested in humans, and Junichi reminds Celena of her long-lost son she loved so much. Soon after the appearance of these sexy demons, Junichi's childhood friend, Itsuki, becomes wild for him. Other characters in the game are Yu, who loves to study paranormal activities, and Runa's little sister, Rona. Junichi and Runa have two totally different personalities, but eventually, the two of them... This game is a "Crazy Love-Comedy Erotic AVG" brought to you by Angel Smile! Please try it out!

[From gamelexgs]