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


The day has finally come for the Tempest Founder's Festival to kick off! From live concerts to incredible feats of monster engineering (and most of all, the massive labyrinth), revelers are sure to have their minds blown. And who should decide to participate in the battle tournament than the hero himself, Lightspeed Masayuki?!


  • 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"


To Be Announced.



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