Light Novel Volume 9/Synopsis

Prologue: The Waves of Another World
Naofumi fought in a Wave together with Kizuna's friends, successfully fend it off and evacuate the village where it happened. After the Wave, Naofumi reminds that his mission in this world is to punish Kyo and bring the Spirit Tortoise's stolen energy back to his world.

Chapter One: Otherwordly Techniques
Naofumi met Alto, a friend of Kizuna. Alto whine about how the recently summoned heroes, vassal weapon holders and other countries in their world seems to underestimate the threat of the waves. Alto showed an ancient book to Kizuna that depicted cooperation between worlds. They then discussed about Kyo, the state of his expanding home country, and an inevitable war with them.

Chapter Two: Quick Draw
Naofumi went to the castle's training ground to hand over Raphtalia's sheath. Glass confirmed that despite having low prana, Rishia indeed have the talent to get stronger. Ethnobalt revealed to have stats growth similar to Rishia's, and then Naofumi motivates him to work hard like Rishia did. Naofumi handed Raphtalia's sheath which gave her a haste-like ability and handed Alto's book to Rishia for her to get some information from it. When he got Spirit Tortoise Heart Shield, Naofumi unlocked a technique similar to Therese's gem magic, so he asked Therese to teach him magic in order to learn how to use the technique.