Parallel rituals were done on the night of the Kiraigou. Five girls were needed to make up the Kanade, the ritual's instrument players, so You kidnapped five, including Misaki, to complete the ceremony. The utsuwa is the ritual's masked dancer who acts as the channel of the souls of the dead. He, You, and a master mask maker decided to resurrect the ritual with Sakuya being the utsuwa. Shigeto's research allowed him to discover some vital information on the Kiraigou, the precursor to the Rougetsu Kagura.
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Sakuya fell into a coma and was to be enshrined underground. The ceremony had failed and the five girls lost their memories. At that moment all participants of the above-ground performance died of a sudden heart attack, while below Sakuya and her Kanade collapsed. Cracks grew on the Mask of the Lunar eclipse and in a moment of climax it shattered, revealing Sakuya's bloomed face. During her performance Sakuya lost focus and began to panic. The five girls were gathered in a circle and in the center Sakuya, wearing a true Mask of the Lunar Eclipse forged by Souya, began to dance to the Tsukimori Song.
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Beneath ground, past the ancient tunnels in times of old, the true Ceremony of Passage was to be performed in secret. On the night of the eclipse, a simplified, tourist version of the ceremony was toīe performed outside of Rougetsu Hall. Sakuya as the Utsuwa during the Ceremony of Passage With the preparations completed all that was left was to wait for lunar eclipse to perform the ceremony under. In preparation for the ceremony, Souya crafted five Kanade masks for the girls and You taught them to play a restored version of the Tsukimori Song. The five were Ruka Minazuki, Misaki Asou, Madoka Tsukimori, Tomoe Nanamura and Marie Shinomiya. You Haibara was charged with kidnapping five girls from Rougetsu Hall to be the Kanade of the ceremony. Five children were then required to fill the roles of the Kanade, the five instrumentalists who played the Tsukimori Song through the length of the ceremony. Shigeto chose his own daughter, Sakuya, to be the Utsuwa for the ceremony. The central performer, known as the Utsuwa, would dance to the sacred Tsukimori SongĪnd don the Mask of the Lunar Eclipse. In order to begin the ceremony, six people were needed to fill the specific roles. Believing that reviving the ceremony would help cure those suffering from the disease, Shigeto, his son You, and master mask-maker Souya Yomotsuki collaborated to arrange a ceremony in secret.
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Nearing the end of his research Shigeto found a link to Luna Sedata Syndrome and the Ceremony of Passage performed in Rougetsu Island's past. During this time You left the island to conduct an independent research on the disease. After befriending Misaki, Sakuya passed down to her a doll they both named Miya - a combination of Misaki's and Sakuya's names. During Sakuya's stay there, she collected dolls in order to preserve a sense of self and to keep her memories, as one of the symptoms of Luna Sedata Syndrome is memory loss. As Ayako was also staying in Rougetsu Hall, Sakuya hoped to spend time with her daughter and guide her with kindness, however, she was unable to do so, and Ayako continued to act out. Soon, Sakuya begins to show symptoms of the same syndrome her mother suffered from, so she was admitted in Rougetsu Hall where she meets Misaki Asou, one of the main protagonists of the game. This drove Shigeto to begin researching the disease and treating the patients diagnosed with the disease. When she was young, her mother contracted Luna Sedata Syndrome and committed suicide in Haibara Hospital. Sakuya is the daughter of Shigeto Haibara and the older sister of You.