Can you help me find this title manga just from the summary?

the story is about a childhood friend who always confessed to FMC from kindergarten till HS, and FMC became less attention and treated it as a daily prank eventually, and then something happened that made MC die (i do not remember). and fmc (i do not know how) back to the past where MMC is still alive, after meet and bla bla bla, MMC not recognize fmc, instead there is no FMC in that world, fmc not back to the past, but go through a parallel world where mmc alive but no fmc existence and mmc already has a girlfriend in that world.
i think the girl meets with Loli deity if I am not wrong. That gives her a chance to meet that boy

i remember reading that manga years ago, but lost track because of slow updates or Batoto getting nuked.