The premise is fantastic here, but the English definitely needs some proofreading. The frame to frame transitions are also too abrupt in my opinion. When I click forward to the next scene or line of dialogue I prefer it if the appearing image fades out while the new image fades in. Not sure how difficult of a change that would be, I just think it would add to the quality of the final product.
Some additional small lines of dialogue could be added as well, example being when Judy bumps into the MC instead of saying "no why would I?" the MC could instead say "No, why would I? You bumped into me when I was just standing here" or something along that effect. It would be nice to also have more scenes with the girls before the whole impostor sister bit just so that they're more fleshed out as character development is concerned when the first bit of major plot takes place. Completely unnecessary, just something I think would increase interest in the story.