A one shot shoujo manga about a girl who's afraid of boys
Is it perhaps Kazekou Engekibu by Asagi Hikaru?


  Much to her embarrassement, the shy Mashio-chan wins a set of couple
  tickets for the amusement park. She feels at a loss for what to do
  since she has always been bad with men. So what will happen to her
  when the drama club president Katokura Aki suddenly declares that he
  would erase her awareness...?