Where to continue the Welcome to Demon School! Iruma-kun manga

Welcome to Demon School! Iruma-kun by Osamu Nishi, 2017. The manga is still ongoing.

• Season 1 (23 episodes): Continue the manga from chapter 45 in volume 6.
• Season 2 (21 episodes): Continue the manga from chapter 95 in volume 11.
• Season 3 (21 episodes): Continue the manga from chapter 147 in volume 17. The finale stops partway into chapter 147, so you'll re-read the first few pages.
• Season 4 (24 episodes): Continue the manga from chapter 215 in volume 25.