The Wood Spirit is a deleted ghost from White Day: A Labyrinth Named School. It was eventually removed for unknown reasons and it's textures were leftover in the data files.
- It bears strong resemblance to Hee-jin whom spirit appears running around the tree seeds during the boss fight.
- Judging by the texture filename, it is speculated that the wood spirit is Hee-jin and will appear after you defeated her.
- Wood is a possible reference to the Wood Amulet.
- Looking at the script, she only appears when the tree ghost appears and will remained there for good.