I'm Practicing Ninjutsu in Jujutsu Kaisen!

Do not invite, I have traveled through time. The bad news is that my parents were cursed and killed right after I traveled through time. The good news is that Gojo Satoru picked me up and brought me back. I found the strongest ninjutsu system. But this system is a scam, it can do nothing but cheat the host. So what if the system is a scam? I beat Fushiguro Megumi to recognize me as my brother. I used delicious food to whet Zenin Maki's appetite. I became brothers with the future strongest Otsutsukoshi Yuta. I exchanged phone numbers with the villain Geto Suguru. How should I put it. I think these experiences are okay...