Summary: With Yhwach's death, the Tousand Year Blood War is finally over and peace reigns over Soul Society once again but, during one of Kurotsuchi Mayuri's researches it is discovered that a passage to a world that is neither earth, Hueco Mundo or even Hell appeared inside the Dangai. Not being able to close the passage and fearing that a new threat may appear, Captain Commander Kyoraku decides to send a small group of experienced Shinigami to investigate the new world, this group consisting of Captain Soi Fon, Lieutenant Kuchiki Rukia, Lieutenant Abarai Renji, Shihoin Yoruichi and the substitute Shinigami and Savior of Soul Society, Kurosaki Ichigo.

I had this idea for a long time but since I don't have a big amount of time to write now, and the fact that need to finish my other stories doesn't help so I decided to put this as a challenge.

Mondaiji timeline is up to you, it can be at the very beginning of the series, after what the anime adapted, Flag of the Ouroboros Alliance arc, Azi Dahaka arc or even Last Embryo are fair game.

Other Bleach characters can be added, be it more shinigami, arrancar, fullbringers or even the quincy girls.

Now about power level...Let's be honest, even Yhwach would not be able to defeat many of the Tier Characters in Mondaiji, after all, they are easily star level or higher so feel free to give a power up to Ichigo and the others, you could even make Ichigo be a origin possessor and that would actually fit with the Mondaiji lore, so yes, you can give him an Another Cosmology.

Pairing: Ichigo x any girl you want, or no pairings at all if you don't want romance in the story.