Mobile Suit Gundam: The Witch from Mercury S01 E17 Precious Things

"This witch... rides a Gundam."

Having learned of the connection between Prospera and Delling, Miorine decides to take over the Quiet Zero project in exchange for Suletta's liberation. Miorine's 17th birthday is imminent. Now the curtain rises on the final duel that will determine her bridegroom.