Today the competition begins between final eight (besuto eito) teams remaining from the 32 teams invited to the spring high school single-elimination baseball tournament.
The Besuto Eito are
Kanto Dai'ichi (Tokyo Metropolitan District)
Yokohama (Kanagawa Prefecture)
Osaka Toin (Osaka Prefecture)
Aikodai Meiden (Aichi Prefecture)
Urawa Gakuen (Saitama Prefecture)
Naruto (Tokushima Prefecture)
Kendai Takasaki (Gunma Prefecture)
Kosei Gakuin (Aomori Prefecture)
Population ranking of the 8 prefectures represented among the 47 prefectures
Tokyo Metropolitan District (#1)
Kanagawa Prefecture (#2)
Osaka Prefecture (#3)
Aichi Prefecture (#4)
Saitama Prefecture (#5)
Tokushima Prefecture (#18)
Gunma Prefecture (#19)
Aomori Prefecture (#31)
Yes, I know a number of the surviving schools are magnet schools recruiting from all over the country. However, so are a number of the schools in the least populous prefectures.
The general gist remains: the rich get richer and the poor go home.
Later - Gunma Prefecture had an advantage in that it had two teams entered in the tournament. Then again, so did Hokkaido (#8) and Nara (#29). Both the entrants from those two prefectures were eliminated.