Chi/Chronology

Recruitment
Like the other girls descended from the heroes, Kai had contracted demonic possession and was discarded and abandoned by society until she was forgotten. She was found and rescued by members of Shadow Garden sleeping alone in a trash at the end of the alley, malnourished with the curse spreading over her body. Shadow Garden cured her, elaborating the truth, earning her loyalty and subsequently recruited her into the organization, being among the earliest recruited when Shadow Garden began their membership expansion.

At some point later, she 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.

Sanctuary Infiltration
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.