L'Arc Berg Sickle/Chronology

Volume 5
L'Arc is first introduced when Naofumi and his companions boarded the ship to sail to Cal Mira. L'Arc and Therese Alexanderite at first did not believe that Naofumi was the Shield Hero, as he didn't seem to fit any of the bad rumors circulating around the shield hero and also because they already encountered or hunted a number of fake shield heroes capable of changing shields (hired by the Church of the Three Heroes to ruin Naofumi's reputation). He advised Naofumi to stop pretending to be the shield hero, as people may dislike him. Naofumi eventually gave up in trying to convince them of him being the shield hero.

L'Arc and Naofumi agreed to level up together on the island after two days. L'Arc and Therese grew worried about Naofumi's team when they didn't return for the night and went to search for him. Naofumi was getting too comfortable with them. Before going to level up together, L'Arc told Naofumi that the four holy heroes are on the island and that he found the Shield Hero. Curious, Naofumi asked who he thought the Shield Hero was. L'Arc pointed at Mald, much to the dismay of both Naofumi and Raphtalia. Both agreed that Mald is the type to cause problems. While leveling together, both sides were impressed with each others' skills. L'Arc and Theresa began to suspect if Naofumi really was the shield hero. Naofumi then asks them to join his party.

During the fight against the wave, L'Arc concluded that Naofumi really was a Cardinal Hero and tried to kill him. Though their target was all the four holy heroes, he didn't believe the other three were true Heroes given how weak they were. However, L'Arc and Therese still couldn't beat Naofumi even with the help of Glass and so had to return to their own world.

Volume 7
In the next wave, they again traveled to the other world. When they wanted to return to their own world, they encountered Kyo, who was another wielder of a vassal weapon of their world but tried to rule the world instead of following his mission. Their Vassal Weapons begged them to stop him. Thus they stayed in this world and tried to stop him. By this time, they heard of the Spirit Tortoise defeat (its head decapitated, but not truly dead) from Naofumi and accepted the fact that he was a capable hero despite being enemies.

During Naofumi's second fight against the Spirit Tortoise (head regenerated) L'Arc met Naofumi again. He first encountered him when Naofumi tried to travel to the heart of the Spirit Tortoise and Naofumi began to attack him without listening to his explanation. But before they could finish a decisive blow, they were separated by a living wall. After that, they met him again during the battle against Kyo. L'Arc then explained to Naofumi that now he didn't have any intention to fight against Naofumi, but had to fight alongside him against Kyo. After a hard-fought battle, they had stopped the rampaging Spirit Tortoise and defeated Kyo. However, Kyo escaped through a portal to L'Arc's own world to escape. Both L'Arc and Naofumi's team then entered the portal to chase after the villain.

Volume 8
As the Heroes enter the portal, they quickly release that it was trapped. L'Arc, Glass, Therese and Raphtalia were all sent to a specialized prison mean to hold high-level/powerful adventurers. Thankfully, Raphtalia was able to use her illusion magic to help the party escape. After a long journey through enemy lands, they were eventually reunited with Naofumi, Rishia and Kizuna. Finally together, they started making plans to attack Kyo's laboratory.

Volume 9
After some preparation and repelling an attack from Kyo, L'Arc and the other heroes were able to find and enter Kyo's laboratory. Eventually, they were able to fight against Kyo and defeat him for good. L'Arc and the others then began to initiate peace talks with other nations in order to unite their world against the waves.

Volume 17
Unfortunately, the peace they had forged in their world would not last for long. Several Vanguards of the Waves had betrayed the heroes during their peace talks. The only surviving Legendary Hero - Kizuna - was kidnapped while L'Arc and Ethnobalt had their Vassal Weapons stolen. Ethnobalt was able to bring Naofumi in a reinforcements just in time and they were able to recover L'Arc's Vassal Scythe. They eventually discover that Kizuna is being held by the wielder of the Vassal Musical Instrument named Miyaji. After a tough battle, they are able to save Kizuna.

Volume 18
As part of their mission to enhance Naofumi's cooking, the Heroes search for the cooking master named Seya. However, it is revealed that he had been using addictive drugs to enhance his cooking. They eventually defeat the reincarnated individual and saved the villagers he was controlling.

Volume 19
During the two-pronged attack lead by the Harpoon Reincarnator, L'Arc participated in the fight within his own country. His team fought against Mald and various other dangerous creatures. However, they were able to successfully defeat their attackers before Naofumi and the others were able to come as reinforcements.