Tsukikage no Simulacre -Kaihou no Hane- by Applique - Adult Sex Game

Seiichi received an invitation letter from his dear cousin Rei, whom he had not seen since his move. She asked him to attend a mysterious family ceremony that takes place every few years. He decided to return to the small town of Izawa, where he once lived, and reunited with his ch*ldhood friends. There is a legend here about a living doll in a huge mansion in the forest, and she always takes the form of a girl from the Kisaragi family.