Shikei shikko

What if their was a secret group of people that helped the Soul Society? Before the fake Karakura Town invasion a group of specialized individuals come help the Soul Society. Who are these people and how does Yamamoto and Kenpachi know them? Rated M for language and later lemons. IchigoXOC IkkakuXOC ToshiroXOC RangikuXOC ByakuyaXOC KomamuraXOC HisagiXOC RenjiXOC