The draw for the Best 8 was done between the 1st and 2nd games of Day 11. I'll let it simmer.
Day 12, Game 1 - Kousei Gakuin (Aomori) vs.[Winner of Toukou Gakuen (Kanagawa) vs. Urasoe Shougyou (Okinawa)]
Day 12, Game 2 - Osaka Touin (Osaka) vs. [Winner of Tenri (Nara) vs. Urawa Gakuin (Saitama)]
Day 13, Game 1 - Sakushin Gakuin (Tochigi vs. [Winner of Ube Koujyou (Yamaguchi) vs. Toukaidai Koufu (Yamanashi)]
Day 13, Game 2 - Kurashiki Shougyou (Okayama) vs, Meitoku Gijyuku (Kochi)