Sisteritual

Sisteritual is a Japanese hentai visual novel with an incest theme. The story follows Yahiro Kusuzuki, the young owner of an ancient shrine which he protects along with its shrine maidens: his older sister, Maina, and his younger sister, Suzu. Yahiro inherited ownership of the Kusuzuki Shrine when his father passed away some years ago, but due to his young age at the time, he was unable to perform the inheritance ceremony and officially succeed his father. Without a proper shrine master, miasma began to gather around the shrine and infect Yahiro. When Yahiro reaches adulthood, his grandmother reveals the shocking details of the inheritance ritual: to become the shrine master and fulfil his destiny, Yahiro must have sex with the shrine maidens - his beloved sisters - to release the miasma that has built up inside him. The game features voice acting for Maina and Suzu.