Oh boy

I'm so confused as to what's going on!
So far all I can conclude from my observations is that the main guy is killing in order to find "the one who manipulates time" and somehow has this random dude who is given a shitty backstory as to why he thinks there friends, like no offense but all I got was he went back and the mc gave a camera back while covered in blood? And random girl in their class? Now we got classic bully seniors and the victim who has decided to be a hero after just finding out he can revive people after failing to in the past? I see why he hates our mc since the mc just wants to kill and get shit done with but white hair wants to do it peacefully, which wouldn't work because then what would you need the time loop for without something going bad like death? Also his family is being threatened, poor guy :( he's getting his savior arc（￣へ￣）I can tell... also new student possibly has powers seeing as she stared at the mc or at least knows something? And now we got someone who pushed the senior to his death ╮(￣▽￣)╭, he deserved it tbh! But I'm just gonna save to see how this plays out in the end! Thanks for whoever read all the way to the end of my ramblingヾ(☆▽☆)