The DLC integrates directly into the main game, providing additional context and "alterations to existing story events" rather than just being a standalone post-game mission.

They stay with the military but eventually fight the kingdom's corruption from the inside.

Focuses on Sachiyo and Zepp during their initial meeting, fleshing out the history of the Viktor Knights.

Reviewers note that the DLC significantly increases replay value by adding more variation and immersion to these existing routes.

Includes 81 new Event CGs that deepen the narrative's visual storytelling.

Because it adds to the main story, players typically need to replay or load saves from specific points to see the new DLC-exclusive scenes and the Sachiyo chapter. Ideology in Friction (Video Game) - TV Tropes

To understand the DLC, it helps to know the base story it expands:

As they uncover corruption within the kingdom, their paths diverge into three main routes: