Web Novel/Devil's Secret Maneuvers Arc

Seventh Arc of That Time I Got Reincarnated as a Slime Web Novel released in Shousetsu.

Chapters

 * Chapter 120: Setting Off
 * Chapter 121: Hinata and the Kids
 * Chapter 122: Hinata and Yuuki
 * Chapter 123: Predestined Fate
 * Chapter 124: Birth of a Hero
 * Chapter 125: The Memories of the Hero
 * Chapter 126: The Rebellion's Beginning
 * Chapter 127: Excuse and Reflection
 * Chapter 128: Alliance of Three Kingdoms
 * Chapter 129: Yuuki Subjugation Raid
 * Chapter 130: A Sudden Invitation
 * Chapter 131: Demon Lord Leon
 * Chapter 132: Kagurazaka Yuuki
 * Chapter 133: Leon vs Yuuki (Part 1)
 * Chapter 134: Leon vs Yuuki (Part 2)
 * Chapter 135: After the Incident
 * Chapter 136: Eastern Empire

Adaptation Notes
The Light Novel goes into much more details during the events here and even introduces new characters such as Mariabell who does not exist in the Web Novel.