"Tribute to Kagachi-sama," Takahiko returns to his rural hometown with his devoted wife Manami, only to confront his past when he reunites with Ayaka—his first love, now married to his own father as his stepmother. Driven by lingering desire, Takahiko schemes to claim Ayaka, unaware of the village's dark ritual honoring the snake god Kagachi-sama, where women surrender their bodies in nightly netorare orgies led by masked men and his powerful father.