Kiyoharu Kamiazuma, brother to Yuriko and father to Yumiko, initiated a clandestine incestuous relationship with his sister during their childhood. This bond spiraled into cycles of sexual violence, culminating in rape that impregnated Yuriko. She resisted terminating the pregnancy, yet Kiyoharu persisted in his abuse, etching profound psychological wounds into the family’s fabric.

Plunged into madness, Kiyoharu embedded a fragment of a mystical mask—imbued with his memories—into the eye of his brother, Kiyotsugu Kamiazuma. The shard warped Kiyotsugu’s psyche, convincing him he *was* Kiyoharu. Assuming his brother’s identity, Kiyotsugu redirected the abuse toward his niece Yumiko, delusionally conflating her with Yuriko and replicating the same exploitative patterns.

This act extended Kiyoharu’s destructive influence beyond his death. The implanted shard not only fractured Kiyotsugu’s grasp on reality but solidified Kiyoharu’s role as the architect of the Kamiazuma clan’s multigenerational trauma. His history of manipulation and violence became the foundation of the family’s fractured dynamics, particularly shaping Yumiko’s desperate dependence on the goddess Juna to anchor her fractured emotional stability.