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 in numbers further. 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' that commanded everyone reprimanded whenever they actioned in a way deemed wrong. They 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 the 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.
Ichigo Kurosaki, the guardian angel of Karakura Town, had awakened as an Angel 500 years ago whereas he came to be as a divine 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, almost as if someone is 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, 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 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.