He is the older brother of Rin Itoshi. Sae's main goal before the start of the series was to become the best striker in the world, and in turn, the best player in the world, but after leaving Japan and experiencing the professional league in Spain, he changed his dream to becoming the best midfielder in the world after he realized how truly weak Japanese football is.
At the start of the series, he is in Japan only to renew his passport but after hearing about the Blue Lock , he decides to stay. After the Japan U match concluded, his current status and whereabouts are unknown.
Sae is a tall, lean young man with magenta hair and slim teal eyes that are framed by an array of long underlashes just like his brother, Rin. During the National Representative match, he wears the Japan U White 10 jersey with a black shirt underneath the jersey and some black gloves.
Since a young age, Sae has been cold, blunt, and serious. He has only ever cared about becoming the best striker in the world and has only had time for things that get him closer to his goal. Sae can also be arrogant and condescending, looking down on others even if they are older than him and have more organizational authority.
He is egotistical in his football play but has shown to be able to restrain himself and play his position, not trying to outshine others unnecessarily. Sae has a lot of pride as a football player, looking down on Japanese football and all who participate in it. Sae states that he would much rather die or play in Europe with a bunch of college students than play in the J-League or play on the Japan National Team.
