Ichigo, rukia, Chad, Orihime, and some others were in wueco mundo (I don't know if I spelled it wrong or not) when Nnoitora and Grimmjow were on their tail, trying to kill them, when Ulquiorra also appeared making matters worse. Nnoitora having the longest legs, was catching up to the group, the group got away in the nick of time, but Ichigo was a bit too slow and got left behind accidently, but the group couldn't help him, the garganta already closed. But before he knew it, Ichigo was in another the world, luckily with his memory intact.
(This story is discontinued but has a possibility of being rewritten in the future. No guarantee tho)
You don't know how or why, but you've been isekai'd into the world of Jujutsu Kaisen. Although your first instinct is to stay far away from the plot, you've been blessed with an abnormal amount of cursed energy, and for better or worse, you find yourself sucked into the storyline. You decide that you may as well use your newfound powers for the greater good, and if you're lucky, you might succeed in rewriting some of the characters' fates. But it turns out that your presence in this world is even bigger deal than you first thought, and soon, everyone wants to make you theirs.