There is no save file that only allows you to play the new content. The new and old events are started and played at the same time. It doesn't take long; in the time you spend waiting and typing, you would have finished the game. To get a save like that, you would have to play in such a way that only the old events are triggered first and the new ones are left untouched. But I don't think anyone would play like that just to post the save. For example, I saw new scenes on the first and second game days (Girl at the pool) .