This games story branches out at the late parts of the game.

This means for the most part of the game you'll be reading the same story, whichever route you aim for in the end. You'll get some scenes based on the heroine you aim for but %90 of the story will stay same until you reach the branching point. So treasure your first playthrough and pick the heroine you like best for it, because it won't be as unique the next time.