Chi/Chronology

Game (Chronological History)
Kai used to be the daughter of an elven noble who was once a member of Velgalta's Seven Blades as a spear wielder named Karen von Herzog from Velgalta Empire. Karen is also a former First Children who has become the 'Named Child' formerly known as the Shooting Star due to the Herzog Family which is an aristocratic family has been affiliated with the Cult of Diablos for generations had been entrusted with maintaining stability within the Empire.

But in the past year and a half, Karen had contracted a Demon Possession symptoms and she should have been handed over to the Cult. However, her family had neglected their duties as aristocrat resulting in the fate of the entire Herzog Family being purged by a fellow Named Child who was also one another member of the Velgalta's Seven Blades, Sergey Gorman the Storm Sword. Karen suspects that the order of purging her entire family had been decreed by the "Round Table Committee" which makes her feel unable to accept the fact that the Cult would go so far as to eradicate everything her family has built over generations that made Karen resent the Cult for their decision.

Since after her family was destroyed, a malnourished Karen had been sleeping alone in a dumpster at the end of an alley with a curse spreading around her right leg was discarded and abandoned by society until she become forgotten, when she tried to escape the Empire to avoid Sergey's pursuit. At one point during her escape, Karen was momently caught by Sergey as he gouges out her right eye until she manages to escape and Karen puts an eyepatch on for the right eye socket that Sergey had gouged out.

Although she was stricken with Demon Possession, Karen managed to escape from the imperial capital and continued running eastward until she reached the borderland near a remote corner of Madlid City, whilst being chased by Sergey who brings at least twenty subordinates he chose to capture Karen. When Sergey got her cornered, Karen was saved by Gamma and Eta when the two of them was searching for oil fields. Unable to defeat Sergey, the duo took Karen and escaped on a boat made of slime.

At some point later, Karen rose through the ranks to become one of Shadow Garden's double-digit Numbers because her ability and strength are recognized by the Seven Shadows, to which she earn a "Named" Rank no. 22 and becoming Named Numbers when she would identify herself as Kai. Also, Kai established a strong and direct relationship with Epsilon, one of the original Seven Shadows, and worked together with Omega to become Epsilon's direct subordinates.

Anime/Game
As the "Goddess's Trial" commenced in Lindwurm, Shadow Garden prepared for an infiltration mission, and Kai was present in the city. When Shadow suddenly made himself known to summon the memory of Aurora and concluding their battle with the result of Aurora's defeat along with the opening gate to Sanctuary at the same time, Kai was among the Shadow Garden contingent that followed Alpha, Delta, and Epsilon into the Sanctuary. Before entering the Sanctuary, Kai joined Omega by Epsilon's side as they taking Natsume Kafka a "hostage" and entering the Sanctuary, along with the Acting Archbishop Jack Nelson.

Inside, Kai and Omega followed Epsilon with a unit of Numbers to collect and gather all intelligence from the memory world they found within the Sanctuary, confirming some theories on the Cult's origins, learning new details, and understanding their motives much better. While the Slime Bodysuits were malfunctioning due to proximity to the core, Kai and Omega apparently imagined that Epsilon's (fake) breasts fell off and reattached, but when Epsilon was looking at them, they said nothing.

As their investigation mission are complete along with the information they collect from the Sanctuary, Alpha ordered all Numbers to leave which Kai complied and following her order to leave the Sanctuary, leaving Acting Archbishop Nelson to battle Shadow. Then, Shadow Garden's team was outside and Kai saw Shadow erased the Sanctuary using his "Atomic" spell. With the city flooded by the Sanctuary's destruction, Kai and Omega helped escorting Alpha and Epsilon out of Lindwurm with the intelligence they collected.

Anime/Game
When his lord, Shadow, comes to ask his members, in the mitsugoshi company, to help him disguise himself so that he can participate in the Bushin festival of the Kingdom of Midgar, without communicating his reasons, Kai is seen, along with to Omega, in men's jignacio clothing, operating a bicycle-powered manic, created by Eta, to remodel his boss's face, while the latter had his face covered in Gamma slime makeup, and while choosing his face, to change your facial profile.

When Gamma activates the device for the machine to work, Kai immediately starts pedaling to power Eta's machine, beginning the modeling of his boss's face, until finally, his new face ends. After the events of the Bushin Festival, Kai is seen, together with Omega and Epsilon, in the royal capital of the kingdom of Oriana, preparing for the events that are going to take place, for when his lord Shadow will appear by chance, after having been communicated, from the events that his Lord Shadow, did in the royal capital of the kingdom of Midgar, in the bushin festival. Curiously, she sees Delta up on the roof, watching everything, waiting for her lord.

Orianna Kingdom Civil War
TBA