The Ultimate Training

The Strongest Training System was bound to Gojo Satoru.

The System was a responsible, hardworking System. To train Gojo Satoru to become the strongest, it searched worlds far and wide for powerful mentors to teach him. And, worried that Gojo's path to strength would be lonely, it even carefully trained his best friend, Geto Suguru. However...

Hisoka: Yes, Illumi and I had a child. He's silver-haired, and his name is Satoru.

Illumi and the other Zoldycks: ...

Gojo Satoru: My father is Kakashi.

Uchiha Obito: ??? When did Kakashi have a child with someone else behind my back? Heh, this world really is wrong.

System: ...This is how you repay me?! I'm the Strongest Training System, not a Help-You-Find-Your-Dad System!

Theme: Lovers will end up together