Just as Historia is about to be forced into submission by a Titan, Mikasa, Eren, and the Survey Corps arrive, decimating the remaining Titans at Utgard Castle.
Hacchi-Anbient: Likely the name of the fansub group (e.g., Hacchi) or encoder. Shingeki_no_Kyojin_2_05_Hacchi-Anbient.mkv
The episode follows the 104th Training Corps members trapped at Utgard Castle, reeling from the night attack by Titans, including the intelligent Beast Titan. Ymir, having revealed her Titan form, fights bravely but is brutally overwhelmed. Krista Lenz (now revealed as Historia Reiss) is forced to confront her past and her identity to save her friend. Just as Historia is about to be forced
Based on the file naming convention, corresponds to Season 2, Episode 5 of the anime Attack on Titan (Shingeki no Kyojin), which is titled "Historia" (or "Histooria" in some translations). Ymir, having revealed her Titan form, fights bravely
This episode is paramount for shifting the focus from solely fighting Titans to the political, historical, and personal stakes within the walls.
This episode is a critical turning point focusing on character development, specifically uncovering the mystery behind Krista Lenz.
A flashback reveals a promise between Ymir and Krista/Historia: they will live for themselves and not for others.