Osorezan Revoir

Osorezan Revoir (恐山ル・ヴォワール) is a prequel story arc before the events of the Shaman King manga series. The plot refers to the encounter of Kyōyama Anna and Asakura Yoh and his guardian spirit, Matamune, on Mount Osore, Aomori. The arc was compiled in Volumes 19 and 20 in the JUMP tankobons (15 and 16 in the Kanzenban versions ) and was adapted in Episodes 30-33 of the 2021 anime series.

Story
A 10-year-old Asakura Yoh was sent to Aomori with his first spirit partner, the Nekomata spirit Matamune, to meet his potential wife, Kyōyama Anna at his grandmother Kino's house. Upon arrival, Yoh meets Anna, who only views him with a cold demeanor. Strangely since then, the two were attacked by Oni with only Yoh and Matamune to protect Anna. It was revealed that the Oni were an unconscious manifestation by Anna's spiritual powers as Yoh slowly figured it out. However, an extremely powerful Oh-Oni was formed and forced Matamune to sacrifice his physical form as using the last of his powers as Yoh's first Over Soul. With Matamune's sacrifice and Anna's heart opening up to Yoh, the Oh-Oni is defeated.

Cast

 * Asakura Yoh
 * Anna Kyoyama
 * Matamune

prologue to shaman
The 1st half of the Drama CD
 * 1) Northern lights
 * 2) Muge
 * 3) discover
 * 4) IN YOU
 * 5) ねこまたのマタムネ
 * 6) この世とあの世を結ぶ山
 * 7) もがけばもがくほど
 * 8) なんとかしてやる
 * 9) Northern lights (ballade version)

au revoir

 * 1) BOB LOVE
 * 2) In'you no Chigiri
 * 3) Atashi no Naka ni
 * 4) Sagashitsuzuketa Kotae
 * 5) Epilogue
 * 6) Matamune kara ~ Osorezan Revoir
 * 7) Tamashii Kasanete

Vocaloid Song
A Vocaloid song titled on the same name was posted on Nico Nico Douga with the vocals performed by Megumi Hayashibara and lyrics written by the author Hiroyuki Takei based on the poem.

The video received about 700,000 views within ten days of its posting leaving fans to questioned whether the art was actually Takei's and whether Megumi was really singing the song. Shueisha's official Jump X magazine website also posted the video and confirmed the fact on October 21 as the video creator's collaboration to celebrate the revival of the original manga with a new 44-page story in Jump X [Kai]'s fifth volume on November 10.

The song was used as the ending song of Episode 33 of the 2021 Anime.