S1·E12 The Secret Door

Hitomi's party exonerate themselves, and Duke Freid (the ruler of Freid who just returned) grants them an audience at his palace. With their input, Freid prepares for the imminent Zaibach invasion. Meanwhile, Millerna discovers a secret door in her sister Marlene's music box. It reveals a diary -- a diary recounting Millerna and Allen's past...