However, in a strange twist of fate, Elcia accidentally stumbled upon an unknown dimension known as "Area-X" during her very first mission. Following its discovery, more bizarre incidents and conspiracies awaited her one after another - all of this eventually led to discovering the uncanny nature of the world and how it all ties to Elcia s very own mysterious past.
Essi's quiet life was interrupted by a sudden visit of a young man named Yuon. He asked her to investigate a murder case and a mysterious disappearance in the Xen Institute, a school deeply connected to Essi's mother. Tempted by the possibility of unlocking "X-note" and solving her mother's mysterious death, Essi decided to take his request. However, what awaited her there was a lot more than what she could possibly imagine.