My guess so far: Yotsuha is trying to absolutely maximise Uichi's hapinnes and healing from trauma. Making that bully look pathetic due to almost dying was probably her maximalist goal, to make Uichi no longer see his bully as an unstoppable force. Also she probably failed many times before where that bully did die (making the station staff warn the bully at the last second seems inconsistent... also how he BARELY didnt see his moms cuts).
I look forward to a chapter where we see her go crazy from repeating scenarios.
And her watch seems very powerful, seemingly she can time travel whenever she wants, as much as she wants. I wonder if there is a cost...
I wonder why she chose to travel back to seemingly his lowest point (just before he would have kill himself?) in chap 1, instead of at least a bit less back when he was less broken. Is it something stupid, like she wouldnt age down too (very unlikely)? Or maybe it's a more abstract reason, like she wants to punish the most possible amount of guilty people. Or maybe she wants to probve that Uichi was saveable even at his lowest moment (but it isnt really proving much since she has god powers)?
But it does seem like Yotsuha has near limitless control of the situation. I wonder if this is just gonna be a low stakes mix of visceral trauma, cute stuff, and revenge (i'm 1000% down). Or maybe Yotsuha is not as powerful as I thought. Or maybe she breaks down instead (would be a pretty cool twist given how much she probably retries). Or... idk. Anything would be cool, especially going deeper into her powers/struggles, or Uichi finding out. This premise is so good so far, it cant disappoint (also the star rating helped me figure that out but yeah)