Masu Shinichirou is a student at Seikou Academy. He is the primary catcher and captain of the baseball team.
Ogawa is his kouhai. They form a battery at the baseball field.
- Rankings from the guidebook:
- He ranks fourth in Game leading.
- Favorite food : Ginger flavored fried pork
- "We're not pros or Major Leaguers. Even if you'd won us this match with that play, such a win would've only left a bad aftertaste. You really are a hopeless moron." - to Ogawa
- "Your feelings aren't lost on us. The desire to win no matter what... we all share it." - to Ogawa