Ep 21. The Two of Us Shall Waltz

The episode titled "The Two of Us Shall Waltz" is the 21st episode of the first season of the anime series Log Horizon. The episode starts with Akatsuki, the assassin ninja, hatching a plan to rescue their friend Serara from the claws of the Goblin King, who has taken her as a hostage.

Meanwhile, the members of the Round Table Alliance are working hard to prepare for the upcoming invasion by the goblin army, which is expected to be a massive attack. The alliance leaders are strategizing and delegating duties, but there's tension between some members who have differing ideas on how to tackle the situation.

Shiroe continues his quest to unravel the mysteries of the world of Elder Tale. He is visited by Crusty, who updates him on his progress and the assistance he has received from the People of the Earth in finding a way to have food and resources regenerate in their world.

With the help of Shiroe's strategic plans, the Round Table Alliance prepares for the impending attack. However, Shiroe is worried about his friends who are in harm's way, including Naotsugu and Akatsuki, who are risking their lives to rescue Serara.

The episode takes a romantic turn as Akatsuki and Shiroe share a dance together. The moment is both cute and sweet, with Akatsuki confessing her feelings for Shiroe, who is surprised but flattered. The scene brings a much-needed lighthearted moment to the intense situation.

The episode ends on a cliffhanger when the invasion finally begins, leaving the fate of the characters in the hands of the viewers. Overall, "The Two of Us Shall Waltz" is an emotionally charged episode, with romance, action, and drama all packed into one thrilling package.