Light Novel Volume 20/Synopsis

Prologue: Believing Sloth Will Save the World
After receiving a hint from S'yne's Sister that the organization behind the waves might attack Raphtalia's World soon, Naofumi and his party prepare to head back to their world. As they wait for the next wave, they say their goodbyes and discuss with Lyno the information they know about the enemy. Shildina gets permission from her Legendary Ofuda to travel back to her home world and L'Arc is strangely adamant about coming along.

Chapter One: Prisoner Transport
As the wave between Glass' World and Raphtalia's World opens up, Naofumi and his group head back to their world. They also bring along the captured Mald who had been tortured to reveal information about the enemy party. When they walk through the portal, the Legendary Weapons become unsuppressed and Naofumi is able to use his Shield again. They find Trash and update each other on the latest events. As they talk, Naofumi learns that Ren attempted to help the village in his stead, however the Sword Hero collapsed after being overwhelmed.

Chapter Two: Training for an Obstinate Man
Naofumi and Trash continues their discussion on the enemy back at the Melromarc castle. With Naofumi's connections and past history, Trash asks him to negotiate with the accessory dealer Hickwaal in order to reverse-engineer the otherworldly accessories. After the talks were complete, Naofumi teleports to Zeltoble with Raphtalia, L'Arc and Therese to talk with the accessory dealer. They meet the accessory dealer and after some initial pleasantries, Naofumi commissions him to analyze the otherworldly accessories Lyno was able to steal from the organization behind the waves.

However, once Naofumi was almost finished his business, L'Arc burst into the conversation - pleading for the accessory dealer to train him in accessory making. At first, the accessory dealer says no, however L'Arc's obsessive and passionate begging finally convinces the merchant to bring him in as an apprentice. It seems that Therese's obsession with Naofumi's accessories had made him jealous and he believed that becoming a master craftsman was his only way to "keep" Therese. Naofumi and Therese know that L'Arc is delusional but allow him to start his training anyway.

Chapter Three: The Sword Hero's Sense of Responsibility
Finally, after the negotiating was complete, Naofumi and Raphtalia returned to the village where they are welcomed back by the whole village. He is happy to see that the village is doing well and that the villagers have even leveled-up since he was last there. After dealing with the exhausted Ren and rampant Gaelion and the newly classed-up Ruft, Naofumi asks Filo to get in contact with Fitoria. He provides all the information he knows about the vanguards of the waves and the library rabbits (who play a similar role to the filolials). Fitoria then invites Naofumi to the filolial sanctuary.

Chapter Four: The Filolial Ruins
Information to be added later on.

Chapter Five: Village Abnormality
Information to be added later on.

Chapter Six: Encounter with Extinct Monsters
Information to be added later on.

Chapter Seven: Double the Shield Heroes
Information to be added later on.

Chapter Eight: Hero Worship
Information to be added later on.

Chapter Nine: Ancient Siltran
Information to be added later on.

Chapter Ten: The Evil Researcher
Information to be added later on.

Chapter Eleven: Bread Trees and Bread Troubles
Information to be added later on.

Chapter Twelve: A Determination to War
Information to be added later on.

Chapter Thirteen: Online Trolling
Information to be added later on.

Epilogue: Different Constellations
Information to be added later on.