Main Pairing: Grimmjow Jaegerjaquez & Ichigo Kurosaki
Disclaimer: I do not own Bleach or anything related to it, Bleach and all its content characters all belong to their rightful owner. Everything in this story is purely created and based on imagination.
Whole story will progress in third pov.
Prologue
Earth formed around 4.6 billion years ago and together with it slowly came life forms, first microscopic sized and slowly getting bigger, smarter. Together with Gaia's creation, Demons and Angels also came to be once humans have moulded and their emotions and thoughts have came into shape, positive or negative, unconsciously affecting which one of the two immortal creatures grew faster in numbers. The roles of the two supernatural entities were rather obvious, one was deemed to be the incarnation of malevolence while the other of the exact opposite, benevolence. The first is guided by the sheer ecstasy of being entirely free, able to live a peaceful life if they ever wished to but they thrived in chaos, it was all they knew, everything they needed and beyond, without it they were and felt deeply empty, as if something was missing, melting into nothingness. Angels, instead, were controlled by strict rules, having 7 fixed and set 'rulers' from the very beginning of time that commanded everyone, reprimanding others whenever they actioned in a way deemed wrong. The two distinct entities have been archenemies since the beginning of times, disapproving of the other since they first discovered one another. Angels were all against the malevolent beings, thinking they were way too unconfined and morally wrong with all they did whereas Demons thought the benevolent beings should definitely get loose from time to time and that they were excessively dull and had no idea what having fun was about.
Most demons dwell in Hueco Mundo, few having made a 'home' in the living world for the sole purpose of enjoying themselves further while in contrast every angel upon their awakening was designed to a specific city and forced to watch over it and the living beings in it, coming to be a guardian angel of that respective town and its' resident. Many of them were against it, wishing to just peacefully live in Seireitei, away from useless fights and responsibilities, yet, there was nothing they could do about it. Orders were made to follow and whoever went against it suffered harsh punishment, stripped of whatever they came to be and forced to re-live a human life.
Both Demons and Angels, were spiritual beings. The malevolent ones were born from those whom have died while feeling negative feelings, be it anger, remorse, hatred, with time, if no divine being found it to cleanse those emotions, it ever so slowly transformed into evil and naturally got sent to Hueco Mundo unless found by a demon that might either take it there themselves or just consume them. Meanwhile, Angels, are naturally born from the spirits of those that have died peacefully, accepting their fate, just wishing the best for the ones left behind or those whom have been found and sent to Seireitei, thus unlike Demons who are purely spiritual, they are whole souls. Demons grow stronger the more they live and provoke chaos or consume others, flourishing on other's fears. Angels instead, despite slowly growing stronger with time, bloom tremendously the more they help others and do their 'job' right.
The two immortal creatures opposed themselves in every way possible, one thrived on chaos, one on peace. When it came to hosting a human body, demons could take whoever they wanted, angels instead needed consent. Demons were most of the time dark beings, scary, they penetrate the soul and take all that someone is and have, also having the abilities to turn someone into pure dust. Angels were brighter, warm, they comforted those around with their very existence and were capable of healing even fatal wounds if strong enough. They contrasted each other so much it was ironic how they seemed to bump into each other every day, everywhere, almost as if fated in a way or another. Bound to find each other for some unknown reason.
Ichigo Kurosaki, the guardian angel of Karakura Town, had awakened as one 500 years ago whereas he came to be as an angelic being 550 years ago. The male doesn't remember anything of his human life but, unless he is actively blocking the feeling, there's a consistent gnawing on his soul, emptiness with bits of sadness, as if someone was pouring salt over an almost closed wound that never really faded. Ever since the male was created the ones around him were surprised by his kindness, how he was unable to hold hate toward someone even if he wished to, unable to carry malevolent feelings inside him for too long, shortly dissipated into thin air as quickly as they came. As time went by, the other angels which Ichigo considered his friends, held him close, attentively, and declared him to be a sad soul possibly born at the wrong time. Ever since being appointed to Karakura Town he had gone through his fair share of hard times, failing, being successful in his 'missions', witnessing and experiencing things that he'd have rather not. Everything seemed to take a tug at his soul, deemed he did not have an actual heart, as he was a spiritual being. And everyone he held dear couldn't do anything but just watch as the heart-strings of the boy were pulled at not only by the unbeknownst of the mortals but also consciously by both demons and the angels which because of how much they have lived, lost touch with their feelings.