The title you're referring to, Jashin Shoukan: Inran Kyonyuu Oyako Ikenie Gishiki

DLsite: One of the largest platforms for doujinshi and independent adult games.

"Evil God Summoning: Lewd Large-Breasted Mother and Daughter Sacrifice Ritual," the work focuses on extreme occult scenarios. Overview & Production Dark Fantasy, Supernatural, Occult.

The Significance and Purpose of Jashin Shoukan

The ritual was complete; the bargain was struck, leaving behind only the faint echo of a celestial hum in the now-silent chamber.

• Inran: Refers to the act of polluting or defiling one's body or mind.
• Kyonyuu: Translates to " welcome" or "reception," implying the acceptance or invitation of an external entity.
• Oyako: Means "parent and child," suggesting a connection or bond between the practitioner and the summoned entity.
• Ikenie: Signifies a "sacrifice" or "offering," implying a ritualistic exchange.
• Gishiki: Denotes a "ritual" or "ceremony," highlighting the structured and formal nature of the practice.