So a guy is walking through the park on his way to school where he meets an old friend. They go to the same school and she gets into a fight with the class @$$. He saves her. Then they call each other in the middle of the night. They reminisce the first time they met. He saved her from a rather disturbing situation.
Thats what I have so far. Thats the short summary. The plot I have in mind is she leaves after graduation. They share a night together before and they say some stuff. Then a couple years later he gets a call saying that she got amnesia. Now they get to discover themselves and eachother all over again.