Those who've read Xin Zi will smile knowingly. Those who haven't, please give this a chance.
It's about what happens when the two Arrancars Nelliel and Ulquiorra, after briefly putting their faith in science, end up in the Hunter world one after the other. If I don't get too lazy, they might end up in other parallel worlds too.
Complete √ (although I don't know how serious it is)