context: Sena is the main character in the Eyeshield 21 series. Sena is a weak, timid student in grade 1 at Deimon High School. Since elementary school, Sena has been made a slave by her friends. Sena also has a childhood friend named Mamori Anezaki who always keeps her from being bothered by other children. Even so, Sena had very agile legs because she often ran to carry out the commands of the bad boys so that her legs used to run here and there. When Sena successfully passed the Deimon High School entrance test, she was recruited by Hiruma to join the Devil Bats. his mainstay style (Devil Bat Ghost)
question: who is the main character of the Eyeshield 21 anime and manga series?
answers.text: Sena