Ryoujoku★Kazoku System

On his summer vacation, the main character receives an invitation from a well-known company. The assignment is to choose among four women to play the "mother" and "younger sister" roles, then to live with them in a fake family in the role of the "eldest son".

The invitation ends with a note that other than murder, everything is allowed...

Features the Cast Change System so that you can play the game multiple times with different characters in different roles.