Ichigo learns the truth
When the smoke clears, Ichigo sees a third Soul Reaper. But why did he look exactly like Neko! He put his mind back on the task at hand. Neko comes up to him and they tag team. Neko yells out "PURR KYONEKO!" and his Zanpakuto transforms radically!
After around a half hour of fighting Grand Fisher, the Hollow reveals a few things the twins hadn't known about their mother's death and Ichigo's twin. Such as the fact that it was Grand Fisher that had killed their mother and not some terrible accident. This enrages Neko more than Ichigo, and he starts to transform into something from beyond this world. Ichigo is stunned.
When Neko's transformation is complete, his appearance was altered dramatically. It was then and only then that Grand Fisher recognized him as the boy who soul was split into four different parts, each with its own PHYSICAL body! (There cannot be two identical bodies at any time. Any attempt to try this has resulted in disaster.)
Grand Fisher pretty much tells Ichigo what his brother really is. Ichigo is shocked that his twin may not even be his real brother! Nekyo (this is who Neko turned into when he transformed) is still furious at Grand Fisher for what he had done to him many years ago. Kyo appears and jumps onto Nekyo's shoulder.
Ichigo demands than the Hollow explain what he meant when he said that Neko isn't from this dimension at all! Grand Fisher informs those present about the Konpaku that had split into four pieces when he removed his soul. Nekyo remembers all too well of that day. His eyes are lit up by his anger and sorrow.
Ichigo turns to his twin and asks him: "Is it true? Are you really not from this dimension?"
Nekyo looks at him, sighs, and then answers his brother's question. "Hai. What the Hollow said is true, but only partially. If I hadn't happened to walk in that part of the woods that day, I wouldn't even be here. And to make matters worse, thanks to the Hollow, not only is my soul split into pieces, but the dimension I came from and this one have collided and merged together!"
"Impossible. How can your home world merge with ours without anyone noticing!" said Rukia in disbelief.
Nekyo's reply: "I'll explain later. Right now we have a score to settle with a certain Hollow."
The two then resumed their assault on the Hollow. They allowed their fury to take control and this gave them a temporary boost in spirit aura.
Things looked as though the twins would exact their revenge. That is, until Grand Fisher pulled out his last ditch effort to destroy them. His last attempt? To show everyone why he was called Grand Fisher. His puppet transformed from a small girl to Ichigo and Nekyo's dead mother.
The reason that Grand Fisher has defeated Soul Reapers for fifty years was because in everyone's heart, there is someone that they must protect and would never
harm. For the twins, this person was their mother. If Kyo had never encountered the Hollow, the one he would have protected would have been the only person who had learned of the Sohma Family curse and was allowed to keep her memories. And her name was Tohru Honda.
After another 10 minutes, Ichigo and Nekyo were weakening. Grand Fisher tried to finish both of them, but the spirit of their mother held him back long enough for Ichigo to give a one last blow. After his attack, Grand Fisher was the one to retreat. Neko reverted back to his mortal form when he had rested long enough. If there was one thing he knew for sure at that point, it was that this was going to be one of the longest nights of his life.