Ｗ妹ヴィジョナリー

The hero had one problem...
That's because his little sister Arisa has become terribly unfriendly to him.

They used to have a good brother & sister relationship, but ever since his sister reached puberty, they somehow grew apart.

However, one day, the hero witnesses Arisa's **** masturbation scene.
He decides to download an eroge with a younger sister ******e in an attempt to understand his sister's feelings.

However, a lightning strike suddenly occurred during the DL, and at the same time, a girl jumped out of the PC screen!
She was the main ******e, Arisu, of "The Younger Sister of Wonderland," the eroge that the main character was DLing.
Furthermore, Arisu somehow merges with Arisa during the strike...
As a result, two hearts dwell in one body.

In order to restore them to their proper state, the hero must lead a double life with Arisa & Arisu while attempting to get the situation back to normal.

DLsite