|Ugumori High School|
|Age||16 (debut) |
|Date of birth||8 November|
|Education||1st Year High School (debut)|
2nd Year High School 
|Manga||Act I - Chapter 266|
|Anime||S2 - Episode 11|
|Voice Actor||Suzumura Kenichi|
|“||It doesn't matter who were up against, because we will always be the challengers.||”|
— Matsubara in Challengers
Matsubara Nao is a student of Ugumori High School. He was a baseball player until an accident in his second year of junior high; he now uses a wheelchair and has decided to support his high school team as manager.
Matsubara has 'boyish' looks and generally looks friendly. He has dark hair with bangs that cover his eyebrows.
He is known for having good analytical skills and being able to pull his team together. Matsubara has encouraged and inspired many of his teammates by reaching out to them. He dreams of going to Koushien together with the team.
- He along with Umemiya Seiichi and a majority of the Ugumori High School baseball team were on the same Little League team, Adachi Rockets.
- "I've finally found a goal. I want to aim for Koushien, after all."