Naruto: My Mangekyo Is Returning to Basics

I, Uchiha Yahashi, am a special genin of the village. When danger descended, I finally awakened those eyes. However, my Mangekyo Sharingan is neither Amaterasu nor Tsukuyomi. Its name is [Returning to Basics].

Thus, the style began to go awry: Three punches stunned Hagoromo's soul; Yahashi, I am the Sage of Six Paths.

So, what does "gradually Uchiha-fy" even mean?

"Uchiha Fugaku: Although our clan has declined..."

"Uchiha Shisui: Between the village and my clan, I choose to kill myself."

"Uchiha Itachi: Whoever betrays dies, even if it's my own father!"

"Hokage: Now it's just the two of us. I suspect you're a rogue ninja!"

"Uchiha Yahashi: I think you're the one!"