"Teacher, are you awake? I made dinner so let's eat together?" "Who are you?" "My wife Ran... but... I guess today was no good either... too bad." This woman named Ran told me that I had an accident three months ago and lost my memory. What's more, my symptoms were that when I woke up, all my memories were reset, and every morning when I woke up, I was back to a state where I remembered nothing from the day before...