The episode begins with Yayoi and Eiko inspecting the haunted house they want to buy. They notice a wandering ghost entering the house and decide to follow it to determine whether it is a friend or foe. Inside the house, they encounter the spirits of a father and daughter who committed a crime in the house. The ghosts seem to be repeating their past actions, including poisoning the water.

Yayoi and Eiko discover a hidden well underground and realize the ghosts are reliving their murders. They decide to go upstairs and confront the spirits. On their way, they experience visions of the family's past, which reveal that after a tragic accident, they turned to dark rituals in a desperate attempt to find salvation.

The ghosts' goal is to perform a ritual to birth an "angel," for which a living woman is needed. Yayoi and Eiko realize the ghosts are still trying to complete this ritual by impregnating living women with a cursed fetus. They conclude that they must destroy all the "angels" to break the curse.

Meanwhile, Keitaro receives a video call from a friend who encourages him to keep training. He also learns that Eiko wants him to be strong enough to carry her like a princess, which gives her the courage to face the ghosts.

Back in the haunted house, Yayoi and Eiko are separated. Eiko finds herself in a dangerous situation as one of the ghosts tries to make her its "mother." Yayoi intervenes and attacks the evil fetus inside Eiko. They realize they must destroy the last "angel" in the house to fully lift the curse.

The episode ends with Yayoi and Eiko determined to destroy the last "angel" and break the curse so they can finally have a place to store their collected spirits, the "Graduates."