Yuyuko Saigyouji is a ghost "princess" head of Hakugyokurou in the Netherworld. She first appeared as the final boss and main antagonist in Perfect Cherry Blossom, responsible for stealing the Spring from Gensokyo to power the Saigyou Ayakashi and find out who's body was buried under, unaware that it was her own. She was once mistress of the Saigyouji clan with the ability to manipulate spirits, driving her to suicide, her body buried under the Saigyou Ayakashi. She since lost memory of he past.