Amaemu♪ ~Okaa-san no Kazoku Keikaku~

As the protagonist, you get lost and stumble upon a group of peculiar girls.

“Welcome home♪”

At the suggestion of Kanata, the heroine who introduces herself as your “mother,” you end up living under the same roof with her and Enemi, her stepdaughter, who seems to have it out for you for some reason.
What follows is a series of increasingly lewd and escalating events, driven by unchecked desire. But where does this twisted family story lead? What shocking conclusion awaits at the end…?

[Translated from dlsite]