Naraku no Tane -Dain Choukyou SLG | 奈落ノ胤～堕淫調教SLG～

A college student protagonist, his girlfriend and his cousin's childhood friend embark on a trip together. However, they get lost and end up at a mansion.

There, they are captured by the mansion's mistress, a captivatingly beautiful woman in a kimono, towering far above them. She demands the protagonist's cousin and childhood friend.

Trapped in this mansion, with the giant beauty and a world that feels off, the protagonist finds himself unable to escape. He eventually succumbs to his desires and indulges in the pleasure of possessing both his cousin and childhood friend.

Who is this mistress, and can they escape this mansion? The cousin and childhood friend are consumed by lust, while the tall beauty watches. Memories resurface. What awaits them at the end of this descent into depravity?