I Made It All Up, So How Did They Learn the Power of the Grim Reaper?

Su Mu unexpectedly gains the ability to travel between dimensions and awakens the Myriad Worlds Sage System. But he can teach each disciple only one move, so the fates of protagonists and supporting characters across different worlds begin to change.

Sakura: “Master, when will I finally get to meet my senior brother?”

Zenitsu: “What? I have a junior sister? Master, wait for me!”

Me... You two aren’t even in the same world. How are you supposed to meet?