The letter reveals the existence of Shadow of Orion (or a variation of "True Inazuma Japan" depending on the translation), a team made up of players who were originally candidates for the national team but were "discarded" or replaced by the Earth Eleven members.
After Earth Eleven returns to Earth following their victory in the Grand Celesta Galaxy, they are greeted by a mysterious letter. This "paper" is an official challenge delivered to the team. Inazuma Eleven Go Galaxy Episode 33
This episode serves as the buildup to the final confrontation on Earth, where the legitimacy of the Earth Eleven is challenged by those who feel they were unfairly left behind. Context within the Series The letter reveals the existence of Shadow of
As the third and final season of the GO trilogy, Galaxy consists of in total, as noted on Wikipedia . Episode 33 marks the transition from the intergalactic tournament back to domestic rivalry and the resolution of the "fake" Inazuma Japan storyline. This episode serves as the buildup to the
