Board Thread:General Discussion/@comment-4435241-20170524111014/@comment-11860859-20170625234459

CrimsonFlare wrote: According to the wikia the Mukata brothers are in 3rd year in the original game and we know they will appears in Ares. So the argument of Tsunami is probably in high school doesn't work and additionally Atsuya and Hiroto were made younger in Ares.

In my opinion Ares will be very fanservice (is not a bad thing). Because of that it's possible for Tsunami and Tobitaka to appear in an opposing team.

Sorry for my englih, i'm french.

So, their year isn't completely made out clear. Personally, I'd say they were 2nd years, because I don't think 3rd years would depend as much on a 1st year (Gouneji) as much as they did back in the first game. In any case, the FF is an annual tourney, so a year going by makes sense. However, they have de-aged characters such as Kira Hiroto, so if they do so to keep Tsunami in Jr. High, I'm okay with that, he is my fav character after all.
 * In the original Inazuma Eleven games, the Mukata siblings are described as 3rd year students, but in the Inazuma Eleven GO Galaxy game, they are described as 2nd year students. (from Mukata page on the wiki)