Mobile Suit Gundam Valpurgis Eve summary:

Haman Khan's sister stands up for her country!In January 0089 of the Universal Century, Neo Zeon is defeated by AEUG in the final battle. Defeated by the ZZ Gundam, Haman Karn is killed in battle, and the remaining Neo Zeon warriors decide to fight in mourning. In order to counter the one-sided attack, Serana Khan, Haman Khan's sister, makes a sortie with the NT exclusive MS prototype Demartell. The secret story of the birth of the fake Haman Karn from "Mobile Suit Gundam Valpurgis" and the story of the birth of Over.On, which has never been told before, will be depicted!