This is a great story to be honest. I don't understand why some people are confused about the plot or the storyline. It's very crystal clear actually. It's not that deep and it's not confusing at all. You just have to understand that he has an illness a form of amnesia that makes and made him forget happy memories only. Btw. This story is really pure and it showcase/shows the epitome of love so give it a try.
Yessss!
This is really one of the best shounen ai's out there. It tackles necessary and real problems. It is a coming of age type of story with a good character development. I'll give this a million of stars if I can to be honest. :)