aru uta-utai ningyou no kiroku (vocaloid)
或る詩謡い人形の記録 (The record of a certain singing doll)
A storytelling song for KAITO ft Kaiko. By Seiji/Sokkyouden-P 青磁（即興電P）
The rest of the PVs have appearances by Meiko, Hatsune Miku, Rin/Len and Megurine Luka.
Singing Doll Series:
『雪菫の少女』 / Yuki sumire no shoujo (Snow Girl)
『言霊使いの呪い』 / Gen rei tsukai no noroi (Your Kotodama Curse)
『夕刻の夫婦』 / Yuukoku no fuufu (Couple in evening)
『賢帝の愛顧』 / Satoshi mikado no aiko (Clever Emperor's Patronage)
『終焉の歌姫』 / Shuuen no utahime (The Lady of the end)
It appears the creator of the videos, does not want them on Youtube or other uploading sites, so no additional links will be provided.