What a turnaround. Snatching victory from the jaws of defeat. It was going to end badly as just a bitter first love for both of them, until he listened to his heart, ran and stopped her from boarding the train. I was getting annoyed at how he almost destroyed it all by shooting himself in the foot busting the fact that she was already healed, but in the end I can't really blame him much when that dumb rule #3 was revealed.
Nothing particularly new, but the execution for this teenage romance was good. Romantic build-up? Dramatic low point? Chase scene? Love confession? Kiss? Dating phase? Handholding? All there. For a oneshot, this already beats some teenage "rom"coms that already struggle with just the first thing I mentioned.