shoujo with amnesia. oh no. *stale monotone* I never would of seen that coming. Not like a...

You are being generous by saying only hundred manga lol. That's also without mentioning all the times they have used that in novel, video games and visual nove etc. Amnesia is used so often that it feel weird when there's isn't any in a story coming from japan. I mean seriously a huge majority of stories from japan have amnesia in some form.