Human-Monster Interaction

Human-Monster Interaction (人魔交流編) is the fourth volume of the That Time I Got Reincarnated as a Slime Light Novel.

Synopsis
NO REST FOR A NATION-BUILDING SLIME!

Now that Rimuru's monster-centric town has blossomed into a bona fide independent nation, it's time for the next step: build and maintain diplomatic relations with nearby countries! With a group of trusty monster pals, Rimuru travels to the Beast Kingdom of Eurazania and the Dwarven Kingdom to meet with their respective heads of state and represent their domain as best as a slime possibly can. As if there wasn't already enough on Rimuru's mind, the otherworlder Shizu has been appearing inside of their dreams, begging them to save her former students. Looks like that'll be another stop on this pliable pioneer's itinerary...

Chapters

 * Prologue: Beauty in Action
 * Chapter 1: Trading with the Beast Kingdom
 * Chapter 2: King Gazel's Invitation
 * Chapter 3: To Human Lands
 * Chapter 4: The Kingdom of Blumund
 * Chapter 5: The Summoned Children
 * Chapter 6: Conquering the Labyrinth
 * Chapter 7: Rescued Souls
 * Epilogue: A Monster's Natural Enemy

Adaptations
This volume was adapted into the following material:

Manga:
 * Manga Volume 9
 * Chapter 40: Trade with the Animal Kingdom
 * Chapter 41: King Gazel's Invitation (Part One)
 * Chapter 42: King Gazel's Invitation (Part Two)
 * Chapter 43: To the Human Kingdom
 * Manga Volume 10
 * Chapter 44: In the Kingdom of Blumund (Part One)
 * Chapter 45: In the Kingdom of Blumund (Part Two)
 * Chapter 46: Yuuki Kagurazaka
 * Chapter 47: Failed Heroes
 * Manga Volume 11
 * Chapter 48: Teaching Job
 * Chapter 49: Gard Mjöllmile the Merchant
 * Chapter 50: Dwelling of the Spirits
 * Chapter 51: Spirit Queen
 * Chapter 52: Salvation of the Soul
 * Manga Volume 12
 * Chapter 53: Mjurran the Witch
 * Chapter 54: Prelude to Calamity
 * Chapter 55: Natural Enemy of Monsters

Anime:
 * Episode 20: Yuuki Kagurazaka
 * Episode 21: Shizu-san's Students
 * Episode 22: Conquering the Labyrinth
 * Episode 23: Saved Souls
 * Episode 25: Rimuru's Busy Life
 * Episode 26: Trade with the Animal Kingdom
 * Episode 27: Paradise, Once More
 * Episode 28: The Scheming Kingdom of Falmuth
 * Episode 30: The Beauty Makes Her Move