Ep. 4: Usagi infiltrates the Kingdom of D embassy to investigate Princess D's secret treasure exhibition.

Usagi discovers that Princess D, the ruler of the Kingdom of D, which is the largest resource-producing nation of precious stones, is set to display her legendary secret treasure. Suspecting the item might be the "Legendary Silver Crystal," she decides to take matters into her own hands. Consequently, Usagi sneaks into the embassy of the Kingdom of D to get a closer look at the exhibit. Her actions are driven by a desire to verify the identity of the treasure before it is fully revealed to the public, leading to a tense infiltration of the diplomatic mission.

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