Genre: School life, shoujo?, drama, romance

Manga starts off with a girl trying a superstition at the park about counting the number of steps
Girl almost falls but is saved by a boy
Boy is incredibly rude to her?
At some point they warm up to each other
Boy ends up leaving for some reason
Boy forgets the girl when he comes back and she is confused?
(Boy may have been ill?)
Different girl gets involved
She fakes injury (ends up in a wheelchair from a car accident?)

Thanks for any help