A series of Vocaloid songs created by Masa, officially called The Story of the Kitsune and the Demon but most commonly known as the Onibi Series. It also has a novel on Masa's blog.
Oborozuka Akari
Shishikusa Mai
Shishikusa Ryou
Shikyou
Emi
Onizuka Kaori
Ryou's sister
Kaori's descendent
Onibi Akari
Oborozuka Tsukuyomi
Shishikusa Tomonari
Shishikusa Shizune
Masaoka Daiji
Toki-san
Sachiko
Onigumo to Kitsune no Shishi to
Kitsune no Yomeiri
Kimikage Enbukyou
Shikyou Amanojaku
Kubinashi Enbukyou
Meikyou Oni Warabe
Himeyuri Enbukyou
Onibi