In school there are lessons about a turbulent time in history. Many many years ago the earth was plagued by these bazaar abnormalities called "space quakes." These space quakes devastated everything in their path and at first, there was no known cause for these constant disasters. After a massive one devastated the world killing over 150 million people and starting a devistanging chain of space quakes that rocked the world for over 6 months then after that… nothing. For several years after this incident known as Eurasia Sky Disaster there were no space quakes until 30 years later when they began again, though much less frequently and usually to less devastating effects. By this time the world had come up with ways to protect themselves from these disasters, one of them by creating bunkers deep underground. Humanity weathered this storm and eventually the true nature of these Space Quakes came to light, beings known as Spirits were crossing over from a different dimension which bends the walls between these two worlds creating space quakes. Eventually due to unknown reasons the Space Quakes eventually diminished again and the appearance of Spirits stopped completely, and those existing ones vanished. The search and study of Spirits stopped when the trail went cold. No new Spirits appeared and eventually they became nothing more than a story told in class to teach the newer generations about how the current world came to be.

However in the years that followed the silence from this other world a new Spirit Crystal was forming, a naturally occurring crystal unlike any seen before. Spirit Crystals were eventually discovered to be the core of a Spirit's power, however it was unknown how these crystals came to be or where they went afterwards. It was assumed that they were a freak phenomenon and after the quakes ended and with the Spirits disappearance there would be no more crystals. However during this time a new crystal was beginning to form, a crystal that was different from the one that the Spirit was dubbed "The Origin Spirit" and all other Spirits that came after it. It took countless years for this crystal to form and would eventually become known as a Chaos Crystal, a fully formed Angel and Demon crystal that coexisted together. Unbeknownst to the entire world a young woman stumbled across this powerful object, turning her into the first Spirit in recent history. The power at her disposal, though immense, was never detected as due to her unique appearance no spatial quake emerged and she was able to live in peace even after this monumental change in her life. This young woman was the 20 year old Tsubasa Tenshima who gained the immense power to warp, distort, and control space itself. For the next several years Tsubasa continued to live her peaceful life with her 12 year old half sister Ayako Tenshima. The two of them lived alone, orphaned when Ayako was still young, Tsubasa splits her time between nurturing her newfound powers, training to use and understand them to their fullest potential and raising her brilliant little sister who excelled at everything she did, easily outpacing other children her own age and even those older than her.

The world never knew of these sisters, they were insignificant to the world, so no one paid any attention when one day the two sisters wandered into the forest for a picnic to celebrate Ayako getting into high school and her late 16th birthday. The girls travelled deep into the forest, to a small spring that they discovered when they were younger, their own hidden place that no one but them knew about, however they never made it to their destination, and they were never seen again… at least not in that world, in that time. A mysterious force took hold of Tsubasa ripping her from her proper place in time and catapulted her backwards through Time and Space, and unfortunately for Ayako she was caught up in this event as well. They raced backward through the mana rich wormhole, and before Tsubasa's eyes her unconscious sister began to fragment, the powerful mana ripping apart her very being, slowly erasing her from existence. Tsubasa, in a panic tried to use her powerful spatial power to protect her sister, but without being a Spirit in this abundance of mana she wouldn't survive. In a final desperate attempt to save her sister Tsubasa takes hold of the Angelic portion of her crystal and using her own power on it, she fragments the crystal, she ripping her very essence apart and took the fragment of the crystal and fused it with her dying sister to stabilize her essence. Due to the traumatic way she ripped her crystal apart she fell into a deep sleep, losing consciousness for an unknown amount of time as in this passage time had no meaning. When Tsubasa eventually wakes up she was relieved to discover that her sister remained by her side, once again whole and surviving within the wormhole. During her time asleep the shard she had implanted in her sister had blossomed in the mana rich environment and grown into its own unique crystal, its powers unknown, but distinctive to Ayako as no two crystals can share the same ability, even if from the same source. Tsubasa's own crystal had recovered from its splintering, however the once perfectly formed crystal was now marred and cracked, a reflection of her own soul.

Tsubasa held her sister's unconscious form close as who knows how much time passed before the seemingly endless stream opens itself up and Tsubasa finds herself in a dark forest, not unlike the one she had left behind, with her sister in her arms. Using her spatial powers she carried her sister on her back while speeding through the forest using portals in short bursts to cover as much ground as possible. She skids to a stop as she reaches the edge of the forest and peers down at the valley before her and she was delighted to see the lights of a city twinkling in the distance. Over the course of the next several months Tsubasa worked in the town, providing a place for her and her still unconscious sister a place to live while Tsubasa tried to gain her bearings on this relatively primitive world they had been dropped in. Tsubasa quickly learned that the time they had been dropped in the year 2000, a time long in the past where she had come from, and the land they had ended up in was the country of Japan. Using what she had learned in her own time she made a living doing various jobs while keeping a roof over her sleeping sister's head. One day after several months of being in this town a young man appeared before Tsubasa named Isaac Westcott. He requested a portion of her time and for information, and in exchange for her help Westcott would pay quite well. Tsubasa agrees and they sit down together to talk with Westcott who cuts right to the chase and informed Tsubasa that several months ago an instrument he created detected an anomaly in the forests outside of town, where space and time distorted itself. While researching this occurrence he had learned that the same day this had happened a woman had emerged from the nearby forest confused and asking questions like what year it was and where she was and his inquiries had led him to Tsubasa. He demanded to know who she was and where she had come from. Tsubasa silently watches Westcott for several moments sizing him up carefully, she can't help but notice the shady dangerous air about the man. She lets out a low sigh and explains that she is a being known as a spirit, and she had the ability to manipulate space itself. After explaining her story to Westcott he asks her to help him with a magic formula he has been developing, and in exchange he would keep her existence a secret from the world. Tsubasa requests time to consider his request and leaves, telling him she will return to this tavern in 3 days with her answer. Tsubasa debated with herself for days, trying to figure out some way to leave without helping this man, but eventually she came to the conclusion that the best course of action would be to aid him to the best of her abilities and then leave, never revealing the fact that her sister existed or was a spirit as well. Tsubasa agreed to help him in hopes that her efforts would keep her sister safe and that once he was satisfied he would leave them alone. After helping him complete the formula on how to draw the mana of the world to one location Westcott left the sleepy little town behind and Tsubasa took this chance to steal her sister away and disappear in case he ever came to seek them out again.

Not long after fleeing the town Tsubasa once again settles down in another, larger city and lives off the money she received from Westcott and spending her days watching over Ayako who still hadn't woken up since they had arrived in the past. One day while Tsubasa was watching over Ayako she felt something was… wrong, the air hummed with an odd energy and the hairs on her arms stood on end, though she had no idea why. It was about an hour later that an emergency news story flooded every channel on the TV, a bizarre phenomenon has struck Eurasia killing millions, this disaster was dubbed a Space Quake. Tsubasa realized then exactly when they had appeared, right before the first Spirit, the Origin Spirit, came into existence, and she had helped cause the horrific accident that had claimed so many lives. Over the course of the next six months Tsubasa used her ability to control space to limit the quakes around the city her and Ayako were hiding in, making sure to minimize the damage, but ensuring not to meddle enough that someone such as Westcott could track them through these incidents.

After the Space Quakes began to slow down and become more irregular, technology began to advance at a rapid pace to help protect against the Space Quakes. During these years of development Ayako did not stir once, looking the same as she had the day they fell into the portal. Tsubasa, started working for a tech company as a sales representative, and quickly rose through the ranks due to her charisma and her never give up attitude. Eventually she split off and using the money she had accrued, started her own company with a dream of making video games, specifically dating sims and dating apps as the focus, this company was named Cupid. The years continued to turn and no matter how long it was Tsubasa always stayed with her sister, knowing some day she would wake up, and 28 years after arriving in this time Ayako finally awakens. Tsubasa was beside herself, crying and hugging her bewildered sister close to her saying how thankful she was that Ayako was finally awake. After calming down, Tsubasa explained to Ayako everything that had happened from the time warp and spirit powers to how long she had been unconscious for and how so much had changed. Over the course of the next year Tsubasa reconnected with Ayako, who as always, was shy and had her cute disheveled style, and Ayako, always one to cling to her big sister was even more attached to her, hanging on her every word, demanding to sleep with her and spending as much time as she could with her, all while being trained by Tsubasa to use her new found techno powers, and also helping her sister's company develop more games and advancing their apps for them thanks to her enhanced understanding of the devices. After the year came to a close Tsubasa decided to enroll Ayako in school once again, knowing that even with how smart she is she still needs the social interaction, even though she seemed content to stay at home with Tsubasa all the time, taking no interest or desire to go out, not surprising due to her constantly shy introverted nature. Despite her heavy protests Ayako is forced to enroll in Raizen High School as a freshman. Over the course of the year Tsubasa and Ayako become even closer, and unsurprisingly Ayako has little headway in making friends, however despite her best efforts to not interact with her classmates she does become close with one other freshman, a boy named Shido Itsuka and his younger sister Kotori Itsuka, much to Tsubasa's pleasure. On the other hand, Tsubasa took a more serious interest in the movements and experiences of other Spirits, occasionally asking Ayako to step in and help defend these Spirits from a group called the AST, a group dedicated to fighting Spirits with enhanced weaponry. Over time she honed her fighting skills and control over her powers, battled the AST and defended the Spirits she ended up coming across, and in some cases even coming up against them in combat.

As the summer after her first year came to a close Ayako sat in her living room as she argued with her sister in disbelief. "I don't understand why I have to continue going to school Onee-sama, we both know there is nothing the school can do to challenge me." Ayako said in agitation.

"I, more than anyone, know that Ayako. You are a very gifted girl, however it is good for you to continue to go to school. Social interaction is important to a growing girl like you. You have barely any friends and all you want to do is hang out with me or fiddle with gadgets all the time, you have to get out and make friends." Tsubasa told her firmly, as she rejected her younger sisters complaint. "Not only that but with the company doing well, I have decided it might be fun to enroll in college classes seeing as I look that age, you wouldn't want to be stuck at home by yourself everyday while I'm gone would you?" She grinned triumphantly.

"Onee-sama going to classes? You don't need to do something as tedious as that." Ayako responded but was once again shot down with Tsubasa confirming she wanted to try something new. "Well if Onee-sama wouldn't be here then there would be no point in dropping out of school… so I suppose I shall continue." Ayako finished in a defeated voice.

"Good girl, now go wash up and I'll get dinner ready, school starts in a week so tomorrow we will go shopping to get what you need." Tsubasa told her, much to Ayako's delight who scampered off to get ready to eat, leaving Tsubasa sitting here shaking her head, a soft chuckle slipped past her lips as she got up to go to the kitchen.