Vengeful Spirit Septet are enemies from the Kara no Kyoukai Collaboration Event. Occasionally, Rapunzels appear in their place. There are two types: ones with darker hair in a ponytail, and ones with lighter, short hair.
Also appeared in Prisma Causeway Event as Banshees.
The ghost's normal attack flies around the victim, hitting 3 times. It shoots a blue fireball for its critical hits. The ponytail spirits cast Sleepwalking (夢遊), which lowers Debuff Resistance (3 turns), while the short haired spirits cast Dreamfall (夢落), which lowers Defense (3 turns).