The Hiroshima Dragonflies beat Indonesia's Pelita Jaya and South Korea's KCC Egis by a combined 47 points in Dubai before falling to Iran's Shahrdary Gorgan.
Hiroshima coach Kyle Milling's squad held the reigning champion Ryukyu Golden Kings to 32.1% shooting in the decisive match in the B.League Finals.
The Gunma Crane Thunders, winners of 26 straight games, are the hottest team among the 36 combined clubs in the B. League's first and second divisions.
