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When you first see Sena you find a troubled kid just starting off in elementary school. He didn't have many friends only one that was a girl. Of course he was made fun of for that. It was at his elementary school that he learned how to run like he does today. But, even being the fastest kid in elementary school wasn't enough. His "pathetic" life continued on through elementary then through middle school.
Sena as a young boy
Finally after years of being used he was headed for high school. He entered the Deimon High School expecting for things to change. When he got there he realized it was going to be the same when he met more bullies. They went by the Ha brothers. The Ha brothers made Sena run several to several places making him get whatever they want. But, one day when they asked to Sena to go get something for them and he came back with nothing saying they were all gone tempers started to flare. They couldn't believe that he had actually ran to the store and back so fast. So they took him to football equipment room and started to mess around with him and the football stuff. But, then Kurita showed up who was his brother and throws the three boys out except for Sena. He talks about joining the football team but, Sena is unsure. It's when the brothers came back and Sena ran that Hiruma the quater back had Sena join.
So Sena soon found himself at the Devil Bats first game. They were playing against a team called the Cupids but, Sena was just warming the bench. But, when the all star running back for his team falls and screws up his ankle Sena is put in. Sena went in nervous and expected to get destroyed. As he set up they handed him the ball and he jolted off. Tacklers couldn't even catch up to him he was going so fast. Giving them the eventual victory. There next game next week was with The White Knights. One of their all star players was Shin who played on defence and was known for his tackles. The devil bats got destroyed in the game.Sena did manage to make Shin his enemy after Shin found that Sena was almost impossible to tackle. This gave Shin a challenge and Sena learns he needs to train more.
It was another game against the Aliens where at the end of the game he passes out. Sena learns he exausts when he gets over a certain speed. So Sena trains long and hard. Once he tried to go to try outs for a pro team. He left thinking he didn't make it but, it turns out he did. So he returns back to his team and keeps training harder and harder. He became faster and faster and through this whole training he some how keeps his identity a secret. But, it wasn't long till he had to make a tough descion. During a game versus the Bando Spiders Sena reveals his identity to everyone and that he is really number 21. Everyone was shocked that it was him including his best friend from elementary Mamori. They take home the win and Sena becomes popular just like he had always wanted.
After a couple more games the Knights and Devil bats meet again. So the Devil Bats drive begins and Sena starts off good. He learns to get past several of Shin's moves and by the end of the first half the devil bats are only down seven. During the last couple minutes of the game Sena gets handed the ball and almost makes a touchdown for the lead but, is brought down by Shin. The Devil bats get a safety though and they get the punt. They soon score a touch down and take the lead. But, the Knights don't go down and score right back on the bats. Now only a second or two left with and the bats have the ball. They hand Sena the ball and he takes off. Running the fastest he has ever run. He meets up with Shin and uses a couple moves on him and gets past him making his way to the touchdown. The devil bats have won the semi finals and the next game would be against the dinosaurs. Shin and Sena meet after the game and become well friendly rivals.
The devil bats then face off against the dinosaurs. Right when the game begins the bats start to get beat bad. To top it off Hiruma is hit hard and is taken out of play. Now they didn't have a quarter back. So Sena make a quick descion and took the position. Sena has never played before and starts to fumble. Quickly he picks it up and notices his team going down. So Sena convinces the team line to press on and so Sina starts to run the ball himself some more. He scrambles more and more maybe because he can't pass or it's a plan. Eventaully after some small tosses The Devil bats score. But, The dinsaurs start coming back and when it seems all hope is lost Hiruma comes back. This scares the rival team and Sena gets in for another touchdown. Hiruma is still injured though and has trouble throwing a single pass. In the end though the injured Hiruma runs it in for a touch down and they win. Sena through all of his hard word is a MVP of his team.
The team was now headed to the Christmas bowl where they play Gakuen. When the game begins a player named Yamato is the biggest threat. He runs the field covered in snow like it was a daily thing. So everything started to go down hill. Touchdown after touchdown Gakuen took the lead. Thats when Sena noticed he needed to use more teamwork. So him and Monta teamed up and eventually it lead to the bats first touchdown. But, Gakuen still lead with many touchdowns. Its funny though during the game the score board goes out and the score of Gakuen is set a couple points back without anyone noticing. Sena begins to score more and make his way past Yamoto several times. But, they are still losing and the bats just caused a safety on the other team. The bats get the ball. Yamoto starts to defeat the running game though so that bats revert to passing and make another touchdown. The bats now down only seven points but, then the team scores a field goal on them and they are now down ten points with a minute left. But, the bats don't give up. Sena manages to get past Yamato again and score a touchdown and they get the two point conversion. Then the bats kick an outside kick which Monta dives for and barely gets it giving the bats the ball again. So they decide to go with a field goal. It was a long kick but, they make it and the bats win the bowl. The win is celebrated and Sena stays the mvp he is. Yamato excepting that he had just been defeated. The win was celebrated by everyone and the season was a success.
The Ultimate Japan Team
Later it is found out that Sena, Taka, Yamato, and Monto were selected to create Japans national team to go to the World Cup. So they must now recruit. Of course they set off first to the Knights stadium and talk to Shin. He agrees and joins the team. Eventually Agon joins and so does Gaou. They go off and recruit many more players and eventually create there team. They are now headed to the world cup.