Isaac and the Black Sword Knights are responsible for training the Maihama army. While he's in Maihama Isaac gets to know the new crown prince of Maihama, a young boy named Iselus. Iselus respect looks up to Isaac and respects him. At a party for the crown prince's birthday, assassin's make an attempt on his life.
Dareila joins the party at the Boxurt mountains, and the group stops at the town of Saphir. Isuzu learns that the reason the land people enjoy her songs so much is because the world only has 42 songs in total. She gets very sad and stays in her room, but then a giant flock of wyverns descend upon the town.
When Elder Tale was a game, there were talented solo players who would come together whenever they felt like it and defeat difficult raids. Their name was "The Debauchery Tea Party." Now, their leader, the cheerful girl Kanami, is traveling through the vast lands of the Chinese server on her way towards Yamato.
It's February 14th! Akihabara is filled with excitement as the adventurers enjoy their first Valentine's Day. Marielle and Isuzu try to make cookies out of Kokonia fruits, which are said to make someone fall in love with you. Meanwhile, in the Log Horizon guild house, Tetra puts Akatsuki and Minori up to cooking something for Shiroe.
It's almost Christmas in Akihabara. At Lenessia's mansion, Marie and Henriette are all visiting. Lenessia is smiling, but she can't open herself up to the adventurers because of how different they are. Akatsuki, who has been tasked with guarding the princess, is the only one who isn't having fun. She thinks of Shiroe and worries about her own powerlessness. Then, in Akihabara in December, a shocking event occurs.
Shiroe and his friends have come to the Depths of Palm to reach the Sacrifice Clan's gold. The underground labyrinth is filled with powerful monsters that wear them down in a war of attrition. Meanwhile, Akihabara, Akatsuki hears about the "Teachings". She's very interested to know that by completing a high level raid, she can greatly improve the level of her techniques.
Shiroe, Naotsugu, and Regan head to the northern city of Susukino, which was once run by the evil and violent Briganitia guild. They're looking for high-level adventurer's to help them get the the "Sacrifice Clan's Gold". Shiroe visits an unexpected person. Meanwhile, Naotsugu and Regan walk through the frozen town and find a small but pretty girl named Tetra. She calls herself a "galactic idol", and she's very irritating, but her level is 92...!?
It's been six months since Shiroe and the other adventurers have been trapped in "Elder Tale". As Akihabara moves into late fall, the city is excited for the cultural fair. But Shiroe is ignoring the fun and speaking in secret to a land person, Kinjou, who controls the world's currency flows. When negotiations are over he tells his friend's leaving the city. The long-awaited second series of "Log Horizon" begins a new adventure!