Once we've progressed further in the story and unlocked the Magic Mirror, come back here to use teleportation and select the Oni Clan's Hidden Village.
Then choose to teleport to the Temple Front.
Return to where we fought Datsura, stand at this spot, and press V to reveal the hidden chest.
After opening the chest, you'll obtain "Phantom Demon Notes [Datsura]".
This serves as a monster encyclopedia for collection purposes.
