"The Girl's Truth" (or "The Empire's Assassin Blade" depending on the translation). Key Character: Lux Arcadia. Plot Focus: Lux confronts truths about the old empire and his past.
The BD tag indicates this is from the official Japanese Blu-ray release. [Witanime.com] SMNB EP 11 BD-HD.mp4
Character developments involving the main female cast (Lisesharte, Krulcifer, and Philuffy). Technical Breakdown "The Girl's Truth" (or "The Empire's Assassin Blade"