Ep 15. Queen of the Lake

Kirito and Sinon, having discovered that Death Gun is one of the former members of Laughing Coffin, a guild of killers in the original Sword Art Online game, decide to investigate this connection further. They learn that the remaining Laughing Coffin members have formed a new guild called "Sterben" and theorize that Death Gun may be targeting them next. As they continue to gather information, they also participate in a new mission assigned to them by the leader of their own guild, which involves retrieving a legendary weapon called the "Excalibur" from a monster-infested cave at the bottom of a lake.

Kirito, Sinon, and their teammates reluctantly head into the lake, where they encounter a giant underwater creature that immediately attacks them. Despite the danger, Kirito and his friends are determined to complete the mission and retrieve the Excalibur. They are aided in their quest by a group of underwater elves who live in the lake and help them navigate past various obstacles and enemies. Along the way, Kirito discovers that the leader of the underwater elves, a warrior princess named Leafa, is actually his sister Suguha playing a different character in the game.

As they progress through the lake and face increasingly difficult challenges, Kirito and his friends begin to realize that something is amiss. They find evidence that the enemy guild Sterben is also after the Excalibur and may be planning to use it for nefarious purposes. As they continue to search for the weapon, they encounter a powerful boss monster that puts their entire party in danger.

Despite the odds against them, Kirito and his friends refuse to give up and eventually manage to defeat the boss and obtain the Excalibur. However, they soon discover that there is more to the mission than they realized. As they return to the surface, they find themselves confronted by a new threat from an unexpected source, and Kirito realizes that their investigation into Death Gun is far from over.

Overall, "Queen of the Lake" is a thrilling and action-packed episode that combines epic battle scenes with a complex and intriguing storyline. The underwater setting adds a unique element to the show and allows for some spectacular visual effects. The introduction of Leafa as a different character in the game adds an interesting twist to the plot and sets up potential future conflicts. Fans of the series will not be disappointed by this captivating and suspenseful episode.