MIX takes place 26 years from the story Touch. From the legend left by the hero of Touch, Tatsuya Uesugi, Meisei Academy High School was well known for their strong baseball team. 26 years from their glory, the team has not been able to keep their record and lost their fame. 
MIX is about two stepbrothers, Soichirou and Toma Tachibana. The two aim to revive of the once strong Meisei Academy’s baseball team and enter the National High School Baseball Championship. 
Soichirou and Toma were second years in Meisei Academy Middle School. Both boys are talented baseball players. Soichirou has shown excellent skill as a catcher and batter. Though having an extraordinary skill as a pitcher, Toma no longer pitches due to a “certain reason.” 
Once the two enter High School, they pair as a battery and aim to enter the National High School Baseball Championship! 
The passion and devoted emotions will touch your heart! MIX is a high school baseball drama that all ages and genders can enjoy! 
(Source: YTV, edited)

His name is sometimes mistranslated as Matsumoto Hiroshi.

Kouzou Nikaidou