She claims Uichi is killed by "everyone" in page 10 and she is included in that. My guess is that before looping, she may have also done something she regrets to him.
Okay so its maybe time traveller vs time traveller like some people were saying. How else can the informant guy be so elusive? But like... who the hell would time travel to infinitely torture Uichi?? So I dunno if im convinced its actually another time traveller