Hello!

For you to have a chance to answer the Mysterious Ninja of the Season, you have to obtain some points that are obtainable from finishing and accomplishing missions from the tab of the Current Month. After gaining some points, a clue will appear under the image of Mystery Ninja and along with it is a chance to guess who the Mysterious Ninja is. About the rewards, you will be able to claim it on the first day of next month which is October. If you are one of the top first 100 who guessed it right then you will get additional rewards.

You're always welcome wikiii and hello :p