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신원: It's a fanmade MSA anime and manhwa.
배경: In Tokyo, Japan, a young woman had just turned 18, after her birthday one week ago, she was taken to the mountains of Kyoto to the yokais this year as a sacrifice. To keep the fragile peace between the two races, humans must offer one girl every year as a sign of good faith. This year's offering was the first protagonist named Mutsumi from the Fujimoto family who is the 99th sacrifice. This was because she has healing abilities that heals others and yokais. When the arrived there, the yokais already knew what she was. One of them, Rokurokubi, legendary Japanese yōkai (monsters/spirits) that appear as normal humans by day but possess cursed, abnormally stretching necks or detachable heads that fly around at night. Usually appearing as women, they are often victims of a curse resulting from a past sin, acting as mischievous troublemakers or dangerous predators, stretched her own neck to get a closer look at her and circled around her making Mutsumi dizzy just by watching her circle her with her head but recovered quickly. . . What happens next?