Light Novel Volume 8/Synopsis

Prologue: The Never-Ending Labyrinth
Naofumi woke up to find that he got separated from his party, save for Rishia. In this unknown world, they turned back to level 1 and their equipment from their original world are rendered useless. They went to do some level-up but ended up being cornered by monsters and being saved by a hero. After introducing themselves to each other, the hero, Kizuna Kazeyama confirmed that she is a hero from Glass' world but currently trapped in this labyrinth world. After remembering what happened after he jumped into the portal, Naofumi realized that he arrived in this labyrinth world and got separated from Raphtalia and Filo because they were trapped by Kyo when crossing to Glass' world.

Chapter 1: The Hunting Hero
Kizuna tells Naofumi and Rishia about her background and the event that brought her to the labyrinth world. After some leveling and get some meal, Kizuna bring Naofumi to a mysterious archway which is inaccessible for heroes. They discussed the possible options to escape, and when Naofumi find something in his armor, he gets an idea on how to escape the labyrinth.

Chapter 2: Escape
Using Bioplant Seed found in Naofumi's armor, they abuse the spatial anomaly which summoned a dimensional hole to escape the labyrinth world. After a struggle to land safely, Kizuna confirmed that they are in her previous world.

Chapter 3: The Unknown World
Naofumi and Kizuna decided to stick together and get out of the country they are currently at. They arrived at a town where various native races live and Kizuna explain them one by one. Kizuna also explains her world's technology which is quite different from Naofumi's world.

Chapter 4: Selling Drop Items
Naofumi and Kizuna tried to use items from each other world and the results are different from its original functions. Because using an Earth Crystal yield so much experience for Naofumi, he decided to get it to effectively gain levels. To buy Earth Crystals, Naofumi planned to sell Soul Healing Water due to its unavailability in the current world.

Chapter 5: Sales Demonstration
The sale began with a demonstration of Soul Healing Water's effect on Soul People. Three of five bottles was sold and the rest was used up for sampling. Naofumi decided that the next day he will hold an auction to sell the items. After the sales, they went leveling and realized that an activation event has currently occurred in the area. The next day, many people gathered to participate in the auction. Naofumi set a situation to make the bids soared and gain significant profit.

Chapter 6: Otherworldly Equipment
Naofumi and Rishia bought equipment, armors, ores, ofuda and travel voucher. They also leveled up using earth crystals and battles along the way to the capital. At the capital, the dragon hourglass is located at the adventurer's guild. Due to an event involving a vassal wielder is currently held there, the guild is being crowded. Naofumi and co. decided to exploit that to reach the hourglass but some officials noticed Kizuna's presence and ordered the guards and the vassal wielder to capture her. Naofumi and Kizuna successfully stalled the vassal wielder and managed to reach the dragon hourglass to teleport to Kizuna's safe zone.

Chapter 7: The Legend of the Waves
Arrived at Kizuna's home country, Naofumi, Kizuna, and Rishia welcomed by someone who seems to have authority. After introducing Naofumi, everyone looked at him suspiciously. Kizuna asked about the reason behind Glass' assault on Naofumi's world, and then the authoritative man told the truth about the waves according to an ancient text. Shocked by the revelation, Kizuna suggests research regarding the waves before believing the validity of the text. Kizuna also ordered the authority to look for Naofumi's missing party members.

Chapter 8: On the Way to the Hunting Hero's House
Kizuna went home with Naofumi and Rishia to spend the night before starting the search for Raphtalia and Filo. Naofumi asked how Kizuna and Glass became friends. After the conversation, Kizuna went fishing at a beach and Naofumi followed her. While fishing, Kizuna explained how an accessory can enhance her holy weapon. Naofumi wanted to try Kizuna's method to check if his shield can be enhanced that way.

Chapter 9: Shikigami
Naofumi, Rishia, and Kizuna met Ethnobalt who introduces himself as a boat vassal wielder and shapeshifting monster like Filo. Ethnobalt brings Kizuna's shikigami, Chris to help to find Glass. Kizuna asked Ethnobalt to grant Naofumi a shikigami to help to find Raphtalia. Using Raphtalia's hair as the medium, Ethnobalt made shikigami which Naofumi named as Raph-chan. Chris and Raph-chan pointed out that Glass and Raphtalia seem to be in the same location, which isn't a friendly territory.

Chapter 10: The Katana of the Vassal Weapons
By using the boat vassal weapon, Naofumi, and co. arrived in another country and started the search. Following Raph-chan and Chris' direction, they arrived at a town where a show is currently being held. Naofumi finds out that Filo is the object of the show and decide to rescue her first. Considering the difficulty of a frontal confrontation, they planned to sneak at night.

Chapter 11: Rescuing the Angel
In the rescue effort at the night, Naofumi finds out that Filo has been transformed to something like a little chick by an ofuda. They succeeded in freeing Filo from a cage but the man who apparently ran the show awaken and tried to take Filo back. Naofumi vents his frustration on the man using psychological torture inside shield prison to prevent a sound leak. Satisfied with the torture, Naofumi left the man severely broken. but an outside alarm set off and notify people surrounding the building. The Filo rescue crew get away using Naofumi's portal shield to a registered point at the edge of the town.

Chapter 12: Humming Fairy
The night has passed, Naofumi and co. reached the next town. Due to their previous action, Naofumi, Raph-chan, and Filo became wanted criminals. Once they were out of the town, Filo turned into human form and get acquainted with Kizuna. Naofumi worried by the thought of the possibility of Raphtalia being captured and abused like Filo. The rescue crew decided to stop at the next town to gather information, and along the way, trying to help Rishia and Filo gain some levels.

Chapter 13: The Hunting Hero's Skills
Naofumi and co. camping out for the night after some leveling. Filo gets a significant level up, gaining flight ability in her human form and her monster form became a falcon capable of talking. Rishia who previously studied the current world's language started to understand and capable of speaking the language.

Chapter 14: Return Dragon Vein
News regarding an escaped vassal katana holder arrived at the area Naofumi currently in. Resuming the search for Raphtalia, the road to her direction appeared to be blocked by the local authority due to the presence of wanted criminals beyond that point. Filo scouted the area in her monster form and found some robed people being chased by monsters. The search crew decided to sneak into the area by moving over the roof and wearing masks. Jumped down to the area, they bumped into the robed people. Due to Raph-chan and Chris keep pointing at the robed people, Naofumi, Rishia, and Kizuna remove their mask. Lowering their weapons, the robed people revealed to be L'Arc, Glass, Therese, and Raphtalia. Briefly, after their reunion, the one who chased Glass and the others revealed to be the vassal wielder Naofumi fought before. He chased Raphtalia and the others due to Raphtalia appeared to be the one who stole the Vassal Katana.

Chapter 15: The Katana's Choice
Raphtalia tells what happened and how she got the vassal katana. The enemy, now nicknamed as Trash #2 by Naofumi, summoned several white tigers that turned out to be replicas of a protective beast like Spirit Tortoise to attack. Naofumi with all his regathered party prepared to battle along with Kizuna's vassal holder comrades.

Chapter 16: No Incantations
The enemy, Trash #2 rained down his spells without incantations. It gave Naofumi and co. trouble to react but apparently, lack the effectivity of incantation spells. Raphtalia managed to wound Trash #2 using the vassal katana but couldn't bring him down. Enemy's reinforcements seem to keep coming and a large tiger appeared among previously summoned tigers.

Chapter 17: Blood Flower Strike
Glass, L'Arc, and Therese stopped the tigers and Kizuna finished the tigers with single powerful skill. Raphtalia once again attacked Trash#2 with a skill that discourages him from moving. Trash#2 insisted to move, receive repercussion damage and apparently killed. Naofumi proceed to absorb the white tiger's part and asked Kizuna how her skill finished the tigers. Now that the joint search is over, Naofumi and Kizuna's group split up and head back to Kizuna's home country.

Epilogue: Together Again
Naofumi and co. went back to the castle in Kizuna's country. Kizuna scolded her friends and decided to assist Naofumi to punish Kyo as compensation for both her friends and Kyo's misdeed to Naofumi's world. When the talk is over with both Naofumi and Kizuna's parties set the goal, L'Arc ordered the castle attendants to celebrate Kizuna's return. While the celebration being prepared, Kizuna brings Naofumi and his friends to a blacksmith to find out what can be done to their old equipment and make a scabbard for Raphtalia's vassal katana. As they left the shop, the celebration started with fireworks. Naofumi, his friends, along with Kizuna and Glass enjoy the festival.