Claire Kagenou/Chronology

Training and Youth
Claire was born to Mr. and Mrs. Kagenō of the Kagenō Baron Family, and always wanted a little brother until she finally got Cid. During her childhood, Claire was trained in swordsmanship and magic in order to continue on the family name, surpassing her brother in performance and academics.

At age 8, she dragged her brother into the forest for special training, but have encountered the Scarface Gang. Wanting to protect her brother, begged him to flee while she fought off the members of the scarface gang, but to her horror she see's Cid come to her defense and get knocked out just before she passes out. She would later wake up to find her brother alright and see's that the members of the Scarface Gang missing, she was told that a band of hunters chase away the bandits away, however unbeknownst to her that it was Cid that kill all the members of the Scarface gang.

At age 12, Claire often trained with her younger brother Cid outside their house, but was unfortunately disappointed in his underwhelming performance and berated him for it before choosing to punish him. Despite this, she still sought to practice with him whenever possible as she would refine her skills better than with anyone else, and hoped to teach Cid to be better.

Claire learned that she contracted the Demon Possession when she reached age 14. Fearful that she may not live long, she dedicated much of her time with Cid and prepared him for the future. Unbeknownst to her, Cid had secretly cured her while doing "strencthes", and she continued on watching out for him.

Kidnapping & Rescue
When Claire already become 15, she was ready to leave to the capital of Midgar Kingdom and attend the Midgar Royal Spellsword Academy. The night before her departure, the Cult of Diablos infiltrated her family home and kidnapped her with the purpose of using her for their experiments.

Claire was held inside a dungeon where she learned that her kidnapper was Viscount Grease. After delivering some cruel comments about him, Grease inquired if she had suffered Demonic Possession, to which she vaguely confirmed and accidentally brought up Cid during their conversation, causing Viscount Grease to decide to bring him in as well for questioning. Enraged at this admission, Claire broke free of her chains and attacked the Viscount, only to have him knock her unconsciousness. Unbeknownst to her, she was rescued by Cid and his Shadow Garden, and she returned home safely by her own power.

Novel/Manga
Claire hurriedly confronted Iris Midgar after learning that her brother was suspected of kidnapping Iris's sister, Alexia Midgar. She knew that whether or not Cid was a suspect, this would ultimately lead to his execution, and tried vouching that her brother was innocent. This did not move Iris, causing Claire to nearly assault her but was dragged out by Zenon Griffey before that could happen.

Anime
After hearing that her brother was a suspect for the kidnapping of Alexia, although she was told to stay in her dorm wanting to save her brother she left her dorm room wanting to speak with the knights and explain that her brother couldn't have kidnapped anyone. However she was stopped by the other students trying to stop her, Claire had also knocked out two of the students that were trying to stop her. When Rose tried stopped her, and Claire had assaulted her and later was subdue by her. Claire would also dislocate Rose's shoulder still trying to go save Cid but was stopped by the others students. After hearing the knights had cause harm to her brother, Claire wanted to give the knights what they deserved for hurting him but was stopped by Rose and the other students would force Claire back to her dorm.

Sanctuary Infiltration
In the anime, Claire would stop by at Cid's dorm to search for him to go back home for summer vacation with him, which is earlier due to half of the academy being destroyed. But, Claire was unable to find him due to him hiding above her on the ceiling and had left to go home alone for summer vacation.

Bushin Festival Tournament
When the Bushin Festival began, Claire became her school's representative after the previous representative, Rose Oriana, became a fugitive and was disqualified. Claire went to Cid's room to invite him to see her matches, but much to her anger, he was gone. She eventually found her brother, in the manga she barged into his dorm room by breaking through his window and throttled him for making her wait at his dorm, before she explained to Cid and offered him a ticket to a special seating at the tournament.

On the semifinal tournament, Claire's match has started and she wins the fight hoping Cid will watch her match. In the anime, during Iris's match against Mundane Mann, she went to the VIP lounge to find Cid but only to find him missing. Causing her to leave the stadium go search for him in the city. While searching for him she was unware of his battle as Shadow against Iris and Beatrix all over the capital.

At the tournament's climax, despite the several incidents that had occurred, Claire ultimately won the victory of the Bushin tournament by default.

Red Moon Incident
After winning the Bushin Festival, Claire was treated to dinner at Mitsugoshi Co's restaurants by Cid, where she expressed disappointment at Cid for falling behind his studies and not thinking enough about his future. So Claire proposed to her brother that she was going to take him to Lawless City to take part in the assault during the Red Moon event in hope to gain some credit and secure a better position for him.

Once they arrived, Claire left Cid alone while she attended a meeting between swordsmen at the Magic Swordsmen Association to form a plan to subjugate the Red Tower, and discovered that her brother was missing upon her return. She headed out to Outlaw City to search for him and encountered the Vampire Hunter, Milia, who informed Claire that her brother might have been taken to Red Tower to be sacrificed. Because their goals aligned, the two agreed to work together to stop the vampire queen's revival.

Using a tunnel to bypass the Vampires and Ghouls, Claire and Milia met Beta from Shadow Garden, who were there to get a sample of the progenitor's blood due to similarities with Demon Possession. Claire asked Beta if there was a way to cure Demon Possession for which Beta did not clarify but informed the former not to worry about it, much to Claire's confusion. The two then encountered Juggernaut who decided to kill them and nearly overwhelmed them until Milia was forced to reveal her secret to Claire, becoming a full-fledged Vampire to defeat their enemy.

But, Juggernaut was defeated by Shadow as he launches a fast casual upward kick, which the blow sends him flying until he smashes through the wall that leads outside of the tower and cursing Shadow. Claire saw Shadow, but she feels like she knows him but she never met him until Shadow left. When Milia asked about her situation, Claire replied that she was fine and wanted to give an explanation about who she really was and Milia revealed to Claire that she was a Vampire then told her past as a follower of the Blood Queen. After telling her story, Claire doesn't care about her true origins and decides to save her brother together

Eventually, the two finally reached the tower where Claire was relieved her brother wasn't the sacrifice and that Elisabeth was finally resurrected. Claire was impaled before the Vampire Queen grabbed her and sucked her blood, allowing Elizabeth to regain full power. Thankfully, Claire was saved by the spirit of Aurora, who temporarily took over her body and unlocked her full abilities to combat Elizabeth. This fight held the Vampire Queen long enough for Shadow to finish it.

After the battle, Claire reunited with Cid to leave the Lawless City. After bidding farewell to their vampire friends, Claire apologized to Cid for bringing him into the city and nearly jeopardizing his life. She would also reveal to him about her powers through her arm though he was unaware that she became Aurora's host

Oriana's "Black Rose" Civil War Wedding Incident/Return to Earth
While Cid was at the Oriana Kingdom and later in Japan during Winter Break, Claire went looking for him and had asked Skel and Po about his whereabouts to which they did not know. Claire had pulled out her sword at Skel when he asked her out. Unable to find Cid, Claire went back home during out winter break and was upset that her brother broke another promise.

The Academy Disappearances
As the Cult began abducting students, Claire was among those taken and readied for an experiment to merge with Diablos' right arm. After Zeta and Victoria defeated Jean, Claire was already Aurora's host as the former alongside her sub-faction of Shadow Garden planned to continue the experiment under their personal agenda. After Jean's death came to Claire's reappearance. She began to notice ghosts roaming the Academy and was forced to fight them off until during an exam, she unexpectedly barged into Cid's class to trample his teacher. This was during a monologue with Aurora and as she came to her senses, she was embarrassed and left to be reprimanded by the head teacher. The monologue continued until Alexia came to her about the disappearances. Initially contemptuous towards her for her fake relationship with her brother, the two formed an uneasy alliance when she revealed her connection with Aurora. Their alliance was formed because of Alexia's entrapment with the Crimson Order and the Claire's instances with the Cult. Due to this, their alignment intertwined as they started to conduct their own investigation with their first hint being a forbidden book from the library tipped by Claire's friend Nina. At the Library, they were able to translate the book before being ambushed by the head librarian. In the ambush, the head librarian revealed himself as a agent for the Cult. Before they realized it, they were being incapacitated by drugs set up by the agent as he revealed stories of Fenrir and his existence. Before he proceeded to finish the two off, Shadow appeared and defeated the head librarian. In his dying moments,, the librarian revealed that he was a Bushin Festival champion and a Knight who sought justice until he found the evidence regarding the corruption of the Holy Church without knowledge of the Cult's existence and investigated. The investigation went horribly wrong as his subordinates were massacred and his arms was cut off by Fenrir while finding out that his wife became a hostage. In exchange for his wife's safety, he forewent his identity to join the Cult and warned the princess that she'll end up as him.

After the princess stated her resolve to protect her kingdom, the Head Librarian revealed the Cult's true objective is to gain more power as he elaborated the truth regarding the Three Heroes, Demon Possession and that Diablos Cells are only suitable for woman through using the red pills that Zenon used, which he called him a poor student. The Head Librarian never took them believing it's a shame for a swordsman, but stated the potential of them that if the Cult can bring the Demon Diablos back to life and successfully develop the perfect drugs without any side effects, the Cult of Diablos will have extraordinary power that even surpass the heroes.

The Head Librarian also revealed that the quantity for the Tears of Diablos have been dwindling and that he doesn't know what cause of it. Because the eternal life from the Tears will soon disappear if the number continues to decrease, even the Cult's leadership will not tolerate it as they want to revive the demon so they can harvest the "Tears of Diablos" again in large quantities. With the perfect eternal life in mind, their leaders could rule over the world and run it with their hands from the shadows. However, if that Tears disappear, they will lose their eternal life and rule over the world by extension.

The Head Librarian stated that it was no coincidence that Shadow Garden appeared in this era as they'll bring the end of the Cult's long reign and warned Alexia to be careful as the organization are the strongest people in the world. In his dying breath, he questioned if they even really are on the side of justice to protect the peace of the world or they want to take everything on the eternal life and the world from the Cult after their fall. As the Head Librarian breathed with pain, he entrusted the kingdom's future to Alexia before passing as she collected his memento and the incident as evidence.

The following day passed with Claire running into Cid and the two talked about what had happen in a reserved room. She confided to him that the Knight Order has been trying to bury the truth about the head librarian and that someone needed to investigate it. Although she asserted that she'll investigate it, Cid knew that he was the person who'll investigate as she hugged him assuring that she'll protect the Academy, Midgar, and him.

Alexia later ran into Claire and continued their investigation before noticing white hazes were suddenly enveloping the Academy. The two hurried to the Academy to the auditorium to see ghosts attack the students before realizing they're both strained with an magic collar that'll denote when their magic reaches 0. After fending off the ghostly horde, the two ran into Nina and Isaac for a briefing of the situation. Isaac accused Shadow Garden of orchestrating the event when Claire grieved on how things escalated quickly to which Alexia retorted Isaac's accusation that there is little to no evidence to accuse the organization of their involvement.

Anxious for a way out, an unassuming student named Suzuki suggested an idea that the students low on magic will stay in the auditorium as defense while the rest investigate. Claire and the group traced the collar source and noticed that ghost encounters have become sparse. She asked his relative who Suzuki was to which she was unsure and Isaac was suspicious of him. They traced the collars to a church and investigated for clues to find a dungeon. However by the time they realize it was a trap, the group fell unconscious one by one with Alexia finding out that Isaac was the insider for the Cult before collapsing.

Upon reawakening, Alexia and Claire found themselves restrained and saw what has happen to the missing students. They were the students the Crimson Order were investigating and the two realized it was too late for them as too much of their blood and magic were harvested to revive Diablos. They decided to escape to avoid their fate when Fenrir revealed himself. The Round Knight was confident that he'll get away with the incident when Claire heckled him but the princess retorted that Shadow Garden will punish him. Aurora decided to intervene and free the two when the Round Knight proceeded to extract blood from Claire's neck. Freed from their confines, the two confronted the martial maniac but were overwhelmed until Suzuki entered the fray. This was after the two legends recognized each other when they were on deadlock.

When the unassuming student revealed himself to be Shadow, he left to leave the scene after his victory against the Round Knight after cutting off the party's collar without a trace. Barely stable, Claire saw Nina regrouping with the team before she knocked them out. Nina then proceeded to force Diablos' arms onto Claire under Zeta's orders and this resulted in her entering a comatose state.