The Pools composition according to Wikipedia
https://en.wikipedia.org/wiki/…0%93_Women%27s_tournament
Teams were seeded following the serpentine system according to their FIVB World Ranking as of 29 September 2019.
http://www.fivb.org/en/volleyball/VB_Ranking_W_2019-09.asp
FIVB reserved the right to seed the hosts as head of pool A regardless of the World Ranking.
Rankings are shown in brackets except the hosts who ranked 7th.
Pool A
Japan (Hosts); Serbia (3); Brazil (4); South Korea (9); Dominican Republic (10); Kenya (19)
Pool B
China (1); United States (2); Russia (5); Italy (8); Argentina (11); Turkey (12)
samusama made the almost correct prediction about the pool distribution in Oct 2019, with exception it's Kenya i/o Cameroon that will play in Tokyo: