This episode is part of the Fullmetal Alchemist: Brotherhood series. Envy infiltrates Briggs, posing as a young girl named "Kimblee" (the name of the character in the original FMA anime). This episode is pivotal for several reasons, including:
* Envy's disguise and motives: The episode showcases Envy's remarkable ability to shapeshift and deceive, as well as their desire to sow chaos and destruction.
* The Briggs storyline: It introduces the Briggs storyline, a key part of the FMA: Brotherhood arc.
* The introduction of the "Promised Day": The title itself hints at a significant event that will unfold in the future.
If you're looking for a specific moment when Envy goes to Briggs, it's towards the end of this episode.