Clone Doll: Kagai Jugyō

In Clone Doll, the protagonist is a rather "geeky" teenager who is actually a genius: he invented a machine that can make clones of human beings! After he gets a hold on a few hairs that belong to Kimika, his schoolmate and object of his passionate desires, the young scientist creates a clone of her, a young girl who has no other knowledge and wishes but satisfy the hero sexually...

Clone Doll can be considered a visual novel, since there is no continuous interaction with the game world, and the largest bulk of the game is dedicated to text descriptions and conversations. However, during sex scenes the player is able to choose various actions, and interact with the "clone doll" via a point-and-click interface.