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: DeNA BayStars
DeNA BayStars @ Hanshin Tigers (DeNA wins 2-0)
Central League Climax Series First Stage: Best of 3 Series
Game 1: 3 – 1 
Game 2: 10 – 3
Lotte Marines @ Nipponham Fighters (Nipponham wins 2-1)
Pacific League Climax Series First Stage: Best of 3 Series
Game 1: 2 – 0 
Game 2: 2 – 3
Game 3: 2 – 5
DeNA BayStars @ Yomiuri Giants (DeNA wins 4-3)
Central League Climax Series Final Stage: Best of 7 Series – Yomiuri starts with ghost win
Game 1: 2 – 0 
Game 2: 2 – 1
Game 3: 2 – 1
Game 4: 1 – 4
Game 5: 0 – 1
Game 6: 3 – 2
Nipponham Fighters @ SoftBank Hawks (SoftBank wins 4-0)
Pacific League Climax Series Final Stage: Best of 7 Series – SoftBank starts with ghost win
Game 1: 2 – 5 
Game 2: 2 – 7
Game 3: 2 – 3
DeNA BayStars vs. SoftBank Hawks (DeNA wins 4-2)
Japan Series: Best of 7 Series
Game 1: 5 – 3
Game 2: 6 – 3
Game 3: 4 – 1
Game 4: 5 – 0
Game 5: 7 – 0
Game 6: 2 – 11
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.