Where to continue the Tokyo Revengers manga

Tokyo Revengers by Ken Wakui, 2017. The manga is complete at 278 chapters across 31 volumes.

• Season 1 (24 episodes): Continue the manga from chapter 74 in volume 9.
• Season 2: Christmas Showdown (13 episodes): Continue the manga from chapter 126 in volume 15. The season jumps over chapter 123 and only adapts it in Season 3, so read that one before carrying on from 126.
• Season 3: Tenjiku (13 episodes): Continue the manga from chapter 186 in volume 21.

Read the manga: Kodansha.