Fatal Frame (Nintendo Cinematic Universe)

Fatal Frame is a Japanese anime series.

Season 1
An aspiring photographer visits a mysterious haunted mansion to find her older brother.

Crimson Butterfly
Two twin sisters' regular visit to their childhood playspot turns into a nightmare when a vengeful spirit attacks them in a haunted village.

Season 1

 * In 1986, Mafuyu disappears while investigating Himuro Mansion in search of his tutor, Junsei Takamine.
 * Two weeks later, Miku, Mafuyu's younger sister, visits the mansion in search of her older brother.
 * Miku learns that Junsei and his assistants are dead and that Mafuyu was kidnapped by Kirie Himuro, a spirit that haunts Himuro Mansion.
 * Mafuyu bears a striking resemblance to Kirie's deceased lover.
 * Flashback: Shortly before the "Strangling Ritual", Kirie fell in love with a visitor to the mansion. Fearing that Kirie would not want to perform the ritual, the Master of the Himuro Mansion has the visitor killed and lies to Kirie, telling her that the visitor has left. However, she does find out the visitor's fate and as feared does not want to perform the ritual. This caused the ritual to fail and the Malice to leak out, killing everyone in Himuro Mansion and causing the ghosts to remain there and attack anyone who explored there.
 * Miku finds Mafuyu, but Mafuyu decides to stay behind to keep Kirie company.

Crimson Butterfly

 * While on their way to visit their childhood playspot in the Minakami region, twin sisters, Mio and Mayu, follow a red butterfly to a seemingly abandoned village; however, the village contains the tortured souls of the dead, forever reliving the events that trapped them in this state.
 * Flashback: Twins Yae and Sae Kurosawa tried to escape their fate with Itsuki's help. During their escape, Sae was caught and brought back to the village, while Yae escaped. The Minakami villagers desperately hanged Sae to try to satisfy the Hellish Abyss; the attempt failed, causing the Repentance to occur and the village to disappear. During the Repentance, Sae returned from the Hellish Abyss as a vengeful spirit and, along with Seijiro Makabe, made a Kusabi for the Abyss, slaughtering the priests and villagers.
 * Reocurring Moment: Several ghosts refer to Mio as Yae and seem to expect her to perform the ritual with Mayu, who becomes possessed by Sae. Itsuki, however, tries to help her—believing the two to be the Kurosawa twins, he tries to aid their escape from the village again.
 * Mio learns that in Minakami Village, the twin born second is considered the elder, as the village believes that the "elder" lets the weaker, "younger" twin be born first. This completely reverses Mio's implied fate: instead of being sacrificed herself, she must strangle her "younger" twin sister.
 * To save the village, the sisters proceed with the ritual: Mio strangles Mayu, who becomes a butterfly.

Season 1

 * Based on Fatal Frame.

Crimson Butterfly

 * Based on Fatal Frame II: Crimson Butterfly.