Back in the mid-1980s, a female swordswoman named Hisako Hayabusa belongs to an organization of assassins called "The Red Arrow." Along with her brother Shinji, who became an unofficial nurse to their team, helped as much as he can. Until that fateful day during a mission in Toronto, Canada. Hisako Hayabusa fought against countless hordes of Dark Nebula Coalition members. She would come out of that brawl alive, but she lost her right arm in the process. Badly enough, Hisako never actually gave out a sufficiently specific reason for how she lost her arm in the first place, and the organization saw this as incompetence. Unfortunately for Hisako, she had to retire early, being an assassin. Seeking solace elsewhere they ended up in Melbourne, Australia.

Melbourne is the capital and most populous city of the Australian state of Victoria, and the second-most populous city in Australia. The name "Melbourne" refers to an urban agglomeration spanning 9,900 km2 (3,800 sq. mi), which comprise the broader metropolitan area, as well as being the common name of its city center. The metropolis is located on the large natural bay of Port Phillip and expands into the hinterlands towards the Dandenong and Macedon mountain ranges, Mornington Peninsula and Yarra Valley. Melbourne consists of 31 municipalities. It has a population of 4,529,500 as of 2015, and its inhabitants are called Melburnians.

Melbourne rates highly in education, entertainment, health care, research and development, tourism, and sport, making it the world's most liveable city—for the sixth year in a row in 2016, according to the Economist Intelligence Unit. It is a leading financial center in the Asia-Pacific region and ranks among the top 30 cities in the world in the Global Financial Centres Index.

Referred to as Australia's "cultural capital," it is the birthplace of Australian Impressionism, Australian rules football, the Australian film and television industries, and Australian contemporary dance. It is recognized as a UNESCO City of Literature and a major center for street art, music, and theatre. It is home to many of Australia's largest and oldest cultural institutions, such as the Melbourne Cricket Ground, the National Gallery of Victoria, the State Library of Victoria, and the UNESCO World Heritage-listed Royal Exhibition Building. It was the host city of the 1956 Summer Olympics.

All those years being an assassin and putting her brother through emotional hell, Hisako didn't waste any time at all, letting her hair down and spending more time with Shinji, making up for all the trouble she had caused. Turning a complete 180, she became a loving older sister rather than a cold-hearted assassin. However, it didn't take long for Shinji to find solace elsewhere either. He found himself paradise in the form of a Hispanic woman named Joanna Mendez. Shinji and Joanna became inseparable, with some ongoing coaching from his sister Hisako. One year later they became married, and in 1994, they introduced a couple more additions to their family — a pair of twin daughters, Blair and Chelsea.

Hisako and Shinji know their fate, both siblings knew they had a strong connection to the aether as well as the nether, and it was only a matter of time before anyone who was anyone would take an interest in their daughters. Not stressing over the details of their development, Shinji and Joanna decided to raise both Blair and Chelsea as normal kids with hem going to school, them having friends, and them going into daily activities. Naturally, both Chelsea and Blair found their true individual callings in life.

Chelsea's love of painting sparked an artistic side, like her mother. However, she loved working on computers more than dealing with paint since it was a bit messy. So, with some convincing from her mother, she combined both of her passions into one by being an artist creating digital landscapes.

Even though Hisako was happy that her brother and her sister-in-law are not only nurturing their daughters to be productive members of society, they still need to defend themselves. In secret, she started training them. However, she will hide their secret training in plain sight as she decided to take a job at a recreational center, teaching martial arts despite having one arm. There, she would learn many troubled youths and adults martial arts, including her nieces. While the patrons of the recreational center get basic training, her nieces get so much more than that.

At age seven, it couldn't be ignored anymore. These two were incredibly sensitive to aetheral energy, and if they're not ready, they would be taken by the Dark Nebula Coalition or even worse… Hisako started to teach both Blair and Chelsea various styles of martial arts like Jujutsu. Jujutsu is a Japanese martial art and a method of close combat for defeating an armed and armored opponent in which one uses no weapon or only a short weapon.

"Jū" can be translated to mean "gentle, soft, supple, flexible, pliable, or yielding." "Jutsu" can be translated to mean "art" or "technique" and represents manipulating the opponent's force against himself rather than confronting it with one's force. Jujutsu developed to combat the samurai of feudal Japan as a method for defeating an armed and armored opponent in which one uses no weapon or only a short weapon. Because striking against an armored opponent proved ineffective, practitioners learned that the most efficient methods for neutralizing an enemy took the form of pins, joint locks, and throws. These techniques were developed around the principle of using an attacker's energy against him, rather than directly opposing it.

In addition to Jujutsu, many schools teach the use of weapons. Jujutsu schools (ryū) may utilize all forms of grappling techniques to some degree (i.e., throwing, trapping, joint locks, holds, gouging, biting, disengagements, striking, and kicking). There are many variations of the art, which leads to a diversity of approaches, and the change of Jujutsu that the twins learned from their aunt was Tenjin Shinyo-ryu.

Tenjin Shinyo-ryu, meaning "Divine True Willow School," can be classified as a traditional school (koryū) of Jujutsu. It was founded by Iso Mataemon Ryūkansai Minamoto no Masatari in the 1830s. Once a very traditional jujutsu system in Japan, among the famous students who studied the art, was Kano Jigoro, whose modern art of judo was much inspired by the Tenjin Shin'yō-ryū and Kitō-ryū.

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Essentially, Tenjin Shinyo-ryu is the amalgamation of two separate systems of Jujutsu: the Yōshin-ryū and Shin no Shinto-ryu. The distinctive feature of this particular school is the use of atemi or strikes to disrupt the balance of the opponent as well as a more flexible and flowing movement of the body than seen in some older schools of Jujutsu. The more former schools employ somewhat more extensive and slower movements to mimic the use of armor on the battlefield.

Tenjin Shinyo-ryu was developed after the period of civil war in Japan; thus, without armor, the movements emphasized were faster, and more strikes were incorporated. The attacks were also primarily aimed at human vital points and meridians, which were exposed due to the lack of armor. Like most koryu, the Tenjin Shinyo Ryu follows the bujutsu Menkyo ranking system, as opposed to the budo kyu/dan system.

Afterward, Hisako trained the twins in sword fighting techniques, Musō Jikiden Eishin-ryū. The methods of Musō Jikiden Eishin-ryū are broken up into sets based on the principal starting position of the waza and by skill level. The majority of the study is focused on these solo waza; Solo waza uses a single long sword.

Both children under the tutelage of their aunt mastered various techniques from Musō Jikiden Eishin-ryū:

* Seiza no bu (Shoden); The word 'shoden' can be translated as 'entry-transmission.' This set of techniques was derived from Ōmori-ryū and is still often referred to as "Ōmori-ryū." It is the first round of techniques taught. Seiza no Bu waza are performed from seiza, a formal kneeling position, with the general exception of Oikaze, which often begins standing.

* Tatehiza no bu (Chūden); The word chūden (中伝) can be translated as 'middle-transmission.' This set was derived from techniques created by Hasegawa Eishin and is still commonly referred to as "Eishin-ryū." It is the second round of techniques taught. Tatehiza no bu waza are performed from tatehiza, a half-seated position, except Makkō.

* Okuiai Iwaza no Bu (Okuden); The word Okuden (奥伝) can be translated as 'inner transmission,' or 'secret communication.' The Okuden sets contain advanced-level techniques. Okuiai Iwaza is performed from tatehiza.

* Okuiai Tachiwaza no Bu (Okuden); Okuiai Tachiwaza is conducted from a standing position, except the three Itamagoi waza, which start from seiza.

* Bangai no Bu (Okuden); Bangai is extended tachiwaza. This waza is not koryū but was created by Ōe Masamichialong with the Katate Hayanuki exercise. Bangai no bu contains the following waza, performed from a standing position. In addition to variations of Hayanami and Raiden, some lines provide additional Bangai waza.

After both Blair and Chelsea had mastered the Solo waza techniques of Musō Jikiden Eishin-ryū, the pair ended up going their separate ways again with their training. Even though they were born in the same year on the same day and in the same month, there Aetheral Gate was not too similar. Unlocking their Aetheral Gates, they have discovered they can control fire-based magic.

Expressing her creative side, she was able to summon constellations to do her bidding. Something that is indeed commonplace but very difficult to master. The first one she learned to summon was Phoenix, a minor constellation in the southern sky. The constellation Phoenix holds to its name, healing anyone with its fire and its presence. Also, Chelsea learned how to harness the Phoenix at will at the young age of 11, which was easy since the constellation Phoenix grew fond of her in time; even became good friends. Rarely, Chelsea is only a few people in the University to ride on the Phoenix's back.

Like a domino effect, Chelsea has gained more consolation summons at her disposal since quickly summoning the Phoenix, the constellations, Grus, Pavo, and Tucana, are known as the Southern Birds.

First, Tucana is a constellation of stars in the southern sky, named after the toucan, a South American bird. Tucana is pretty much used for search expeditions in forests since they can only travel short distances.

Second, Grus is a constellation in the southern sky. Its name is Latin for the crane, a type of bird. Tucana is used for search expeditions, as well. However, Grus works well in the ocean and river-based areas and can travel longer distances.

Also, lastly, Pavo, a constellation in the southern sky with the Latin name for peacock. Pavo's capabilities are pretty much similar yet different from the Phoenix. Pavo can create distractions and hallucinations to throw off the opponents.

Primarily, Grus, Pavo, and Tucana are used for support. Meanwhile, Phoenix is the only one of the Southern birds to be an attacker of the group. However, Chelsea can quickly summon all four of these constellations and work well with one another. The Southern birds respect Chelsea, and Chelsea respects them. They even serve her as muses for her paintings.

Hisako called The Viridian Sky gave Chelsea a hiltless katana. Its self-sharpening serrated edge flaked away in a regular pattern as it was used, and it had become soaked in the flesh and body fat of the victims she had killed over the years. Thus, she can execute fire-oriented techniques using the oils as fuel. Like her twin sister, she has enormous strength, stamina, resistance to injury, and ability to read her opponent.

Unlike her sister, Chelsea is quiet, level headed, and a sweetheart to be around. Because of this, she makes friends quite quickly and effortlessly. Most of the women adore her and treat her like a princess, something that she despises. Despite her that she is a good sport about it and treats others equally and equitably. She doesn't lust after men as much, and she is rather quite shy around people.

Most men are attracted to her, but she is remarkably oblivious to the fact this leads to many humorous and awkward moments. Rarely, she dates men who are intelligent, sensitive and have a sense of humor. This is something that Chelsea doesn't want to post about since she is afraid that her sister Blair might end up stealing a couple of dates away from her, which has happened in the past.

However, that is pretty much her problem. She does tend to be too sweet and to be too lenient. At times, she continually restrains herself from killing, which sometimes can result in herself being killed in the process. Plus, she does tend to overthink things and to be a bit sensitive and emotional. She even doesn't say what's on her mind, which at times she should do more often.

Even though she is not a pushover by any means, many people see this as a weakness and try to take advantage of her. Which always results in Chelsea retaliating in a noninvasive but humiliating way. Overall, she is a level headed woman who wants to create a sense of balance in this world and will try her best to stay in her means no matter how hard the temptation.