Diary of a Retired Reaper

Barry was your average college student, if you don't count the fact he was doing well. That was until he stubbed his toe and then fell down some stairs and snapped his neck. He goes back to his room to find a black notebook that is apparently his diary, who also happens to be written by his past self and also the god of death. With the new knowledge Barry decides to go on a journey to the peak of the multiverse. Traveling from planet to planet to finish his diary.