The top three teams in each league qualify for the NPB postseason.
The top seed receives a bye, complete home field, and an automatic 1-0 advantage.
The opening round is a best-of-three. The subsequent rounds are a best-of-seven.
Japan Series Winner: Hanshin Tigers
Japan Series Winner: Orix Buffaloes
Japan Series Winner: Yakult Swallows
Japan Series Winner: SoftBank Hawks
The Pacific League had a modified playoff, skipping the opening series.
The Central League canceled its playoff due to the COVID-19 Pandemic.
The Yomiuri Giants automatically advanced to the Japan Series.