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Identidade: It's a fanmade MSA anime and manhwa.
Antecedentes: In the Meiji era, in 1894, a baby girl named Sayaka was born in the Miyashita family in a natrual vaginal birth 6 months ago not long after her parents got married. But just 6 months later after she was born, her mother named Yukari died from an incurable heart disease. So, her father named Jiro taught her how to cook and bake and clean at the age of 9, leading her to embody the Yamato Nadeshiko, indicating that she's kind, peaceful, ladylike, quiet, feminine, gentle, graceful, humble, patient, faithful, pure, polite, family oriented, poised, respectful, virtuous, charitable, selfless, loyal, serious, mature, level-headed. So, she was so good at cooking and baking. But everything changed at the age of 10, this was when her father Jiro married another woman named Ruriko from the Takahashi family. It all started before she met her when Sayaka had her first menstruation early at this age, indicating that she's already capable of bearing children in a natrual vaginal birth and is growing up even though she has never been with a man before, after all, Sayaka is 17 now that is 7 years later. Her mother Yukari was a demon slayer who defeated and killed the Dragon Demon, cutted its head, sealed in underground under the cherry blossom tree under red spider lilies in a small hill. And Ruriko heard about her and she was highly superstitious. This was because she saw her menstruation as "kegare" a Japanese term, central to Shinto, referring to a state of spiritual pollution, defilement, or impurity, rather than just physical dirt. Often linked to death, childbirth, disease, etc. So, Ruriko slept. When Ruriko woke up, she found herself in Infinity Castle, that's when she saw Muzan Kibutsuji. Ruriko desperately tried to convince him to convince her to kill Sayaka, claiming that Sayaka was using secret ingredients to bewitch the family. But no one would listen to a wicked stepmother like Ruriko. Instead, Muzan Kibutsuji ordered a demon to kill and eat Ruriko. What happens next?