Delta/Chronology

Unhappy Childhood
Delta was once a Beastkin Wolf girl named Sarah who was recognized to be the strongest daughter of the chieftain of her tribe. Because her father had about twenty concubines, she had over a hundred half siblings. If she wasn't born a girl, her father would have given her the position of the next chieftain. Upon learning that she had Demonic Possession, Sara's father attempted to kill her, but she successfully hid and escaped.

When her body reached its limit, feeling powerless by the Demon Possession, Sara was found by Alpha and Shadow, she immediately attacked Alpha, even in her weakened state, without even hearing her. But when Sara saw Shadow, she instinctively submitted when she realized how powerful and dangerous he was. Shadow offered to heal her and give her a home, to which Sara readily accepted seeing Shadow and Alpha as her new pack leaders, and Shadow named her Delta soon after.

First Assault on the Cult
Delta and the "Seven Shadows" assaulted the hideout of Viscount Grease in order to rescue Claire Kagenou, and Delta joined her sisters as they killed all the guards under the Viscount's command. After Shadow eliminated Grease, they rescued Claire and return home, but had her escape on her own to hide their involvement at the time. Delta would leave with the Seven Shadows to hunt down the Cult of Diablos, spending a couple of ensuing years building Shadow Garden's network.

Princess Alexia's Kidnapping
Hearing that Cid Kagenō has been accused of kidnapping the Second Princess Alexia Midgar, Delta rushes to the capital because she really misses meeting Cid. Learning that Princess Alexia was kidnapped by the Cult of Diablos, Delta takes part in a rescue mission as she leads the vanguard to ambush the Cult's secret facility bases from Fenrir's Sect Faction as the signal to start the entire operation.

After Alpha orders Shadow Garden members stationed in Midgar Kingdom including Delta to commence their raid, she strike on all known hideouts of their enemies in the capital. At one of these locations, Delta savagely slew all Cult members and split the building in two.

Sanctuary Infiltration
Delta is part of the investigative team that took part in the operation to infiltrate the Sanctuary at Lindwurm. Seeing that Cid Kagenō had won the duel on the "Goddess's Trial" after defeating the Witch of Calamity Aurora, Delta and the Shadow Garden members prepared to enter the Sanctuary after receiving a signal from Beta disguised as Natsume Kafka.

While inside, Delta saw the dark history of the past covered by the Cult of Diablos through Hero Olivier's memories along with the Shadow Garden team, as well as Princess Alexia Midgar and Rose Oriana who unexpectedly followed them, whilst she also detained Acting Archbishop Nelson and watched his behaviors. The moment when Nelson reveals his true identity, Delta attacks him suddenly. However, her attacks were ineffective to the point where she was brought by him into the Sanctuary defense system along with Alpha.

Later, Delta then battle Nelson who uses his powers to send an army of clones of himself to finish off Shadow Garden, but she easily slaughter many of them until the defense system breaks. At the time when Delta is still ready to fight after Nelson summoned Olivier, Alpha ordered her to withdraw once Epsilon with the investigation team she led already obtained all the necessary information then escapes from the Sanctuary.

In the anime, upon returning outside and witnessing Shadow's destructible power to annihilate the Sanctuary, Delta hasn't returned yet following the mission and Shadow Garden guess that Delta is still in the Sacred Land. But, they decide to leave Delta be as she will come back when it starts to get cold.

Great Trading Company Conflict
Ordered by Shadow Garden, Delta had out to eliminate targets from the Great Commerce Alliance who had tried to sabotage the supply chain of Mitsugoshi Co. carriage. During one of these missions, Delta reunites with Cid and excitedly hugs him to his dismay. Cid, who is in undercover as John Smith, orders Delta to withheld information of this meeting which she complies. The two work together in eliminating assassins with one of them being her older brother, Leaf Four.

In her second meeting with her master, Cid orders her to help eliminate Juggernaut of the Black Tower at the Lawless City. She succeeds, presumably cutting off his head and returns to Shadow Garden who were ecstatic to see her, believing that she had been killed. After the Great Commerce Alliance fell and Mitsugoshi Co. position become more powerful in the kingdom's capital, Delta was last seen helping Cid dig through the snow. Delta discovers something but Cid left before she could tell him.

The Academy Disappearances
TBA