You play as Essi as she pursues the truth regarding her mother's questionable death. Her mother left her a necklace which is actually a USB flash drive. Inside it is a locked folder called "X-note". In order to find clues to unlock it, Essi went to the Xen Institute upon Yuon's invitation.
As a psychic, Essi is capable of utilizing multiple psychic abilities such as Psychokinesis, Clairvoyance, and Telepathy. She usually trains at her favorite place, Pegasus Park.