| abstract
| - The main protagonist, Essi is a girl with psychic powers whose mother died under questionable circumstances in an accident ten years ago. Essi's own memory surrounding the event is quite foggy itself; the only thing left behind from that day was a USB-drive disguised as a necklace given to her by her mother, and the recurring dream of a boy named "X". When she is invited to Xen Institute, Essi becomes determined to not only solve the recent murder case, but to finally unlock the secrets of the X-Note, and uncover the mystery of her mother's own mysterious death.
* Abandoned Playground: Her most precious place to visit, based on the fact that she used to visit it with her mother.
* Badass Adorable: When she trains hard enough, this trope comes into play. It's most noticeable in Oure's path, when she's actually able to deflect Loil's bullets.
* Closer to Earth: Compared to her Love Interests. Her main personality trait is that she is down-to-earth and level-headed.
* Conveniently an Orphan: Allowing her to be involved in solving the mysteries surrounding Xen Institute.
* Disappeared Dad: Confirmed to be dead by Essi in her conversation with Oure on Friday 13th.
* Deceased Parents Are the Best
* Every Girl Is Cuter With Hair Decs: Her long ribbons.
* Eyes of Gold
* Friendless Background: She didn't get along with many of the children in the orphanage, and so she was alone most of the time.
* Forgotten Birthday: In Oure's route. Though really, he just messed up the day that her real birthday was on, and tried surprising her a day earlier than he should have.
* Hime Cut
* I Never Told You My Name: With Rexus; she's a bit surprised that he knows her name when she never mentioned it to him.
* I Will Wait for You: Oure's Good Ending; the bonus scene after the credits even depicts Essi's feelings as she waits for him to wake up.
* Jack of All Stats: Essi is one of the few known psychics to be able to use psychokinesis, clairvoyance, and telepathy. That said, she doesn't particularly excel in any of these different branches of psychic power, and she has to train everyday to be decent in each category.
* Little Black Dress
* Madness Mantra: YOU KILLED HIM! YOU KILLED HIM! YOU KILLED HIM!
* Memento MacGuffin: Her X-Note USB necklace. However, the full secrets of the X-Note are only revealed in one route. The others have Essi give up solving it, choosing not to uncover the mystery surrounding her mother's death.
* OOC Is Serious Business: Essi feels more awkward being around Anon when he's being straight-forward and serious than when he's being a playful pervert.
* Power Floats: At the end of Anon's Good Ending, though Essi initially believes that he is capable of doing this.
* Roaring Rampage of Revenge: In Anon's Bad Ending, she loses touch with her sanity and ends up killing Loil in a fit of rage.
* Slap Slap Kiss: With Anon.
* Sleep Cute: In Oure's path.
* Tall, Dark and Bishoujo
* Tragic Keepsake: The X-Note necklace that her mother left her on the day of the accident.
* Tsundere: In Yuon's route as a Type B, and in Anon's route as a Type A.
* Was It All a Lie?: When she finds out Yuon was manipulating her feelings and using her to tap into his own psychic abilities, she levels this accusation at him.
* Why Can't I Hate You?: When Essi chooses to go talk to Yuon in Anon's path, she can't bring herself to betray Anon to Yuon as Scid's killer, as she has grown to love him too much.
* Your Approval Fills Me with Shame: Inverted. Essi initially commends Anon's information gathering skills, only for him to proudly ask if she's impressed. Essi regrets praising him.
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