Reply To: Who made the Purim story and where is he from?

If you want to know who made the story happen, the answer is Hashem.

If you want to know who wrote the story, I believe the answer is Mordechai.

And today is indeed Rosh Chodesh Shevat, but it’s okay; seforim of Tanach can be studied at any time, as long as it is not Nitul or Tisha B’av.