Monster Capital Opening Festival

Monster Capital Opening Festival (魔都開国編) is the ninth volume of the That Time I Got Reincarnated as a Slime Light Novel.

Synopsis
AN EVENT OF MONSTROUS PROPORTIONS!

The Tempest Founder's Festival is in full swing, with Rimuru and all the monsters under them keeping busy setting up the attractions. From live concerts, to incredible feats of monster engineering (most notably, the massive dungeon), revelers are sure to have their minds blown. But all eyes are on the main event-the First Tempest Battle Tournament-and who should decide to participate but the Hero himself, Lightspeed Masayuki! What will come of his chance encounter with the demon lord Rimuru?

Chapters

 * Prologue: "The Lightspeed Hero"
 * Chapter 1: "The Eve of the Festival"
 * Interlude: "A Late-Night Meeting"
 * Chapter 2: "The Founder's Festival"
 * Interlude: "A Problem Arises"
 * Chapter 3: "The Battle Tournament"
 * Interlude: "The Midnight Conference"
 * Chapter 4: "The Final Round and the Labyrinth's Grand Opening"
 * Chapter 5: "After the Festival"
 * Epilogue: "Flames of Avarice"

Adaptations
This volume was adapted into the following material:

Manga:
 * Manga Volume 24
 * 107: The Lightspeed Hero
 * 108: The Eve of the Festival
 * 109: Reunions and Encounters
 * Chapters not added to the volume yet
 * 110: Culinary Achievements
 * 111: The Founder's Festival

Anime:
 * To Be Added.