An official gaiden for Mobile Suit Gundam: The Witch From Mercury will start in Spring 2023. This will be the first official spin-off for The Witch From Mercury since the show started in 2022 and involve new characters. It will focus on a new witch and her assistant, who is a young boy. Their character designs appeared in the March 2023 issue of Monthly Gundam Ace. [Thanks, ryokutya2089!]
Mogmo, who designed the characters from Gundam: The Witch From Mercury, is still the designer for the side story. It will start Vilda Milen, who is a new witch and a researcher from Vanadis. She somehow survived the Vanadis Incident, which we saw in the Prologue for The Witch From Mercury. With her is a young boy named Kiyu Rabbot. Kiyu is her assistant and the two of them travel around Earth in a trailer. While pictures of the two are not online yet, Kiyu has dark skin, silver hair, and red eyes. It is unclear if there is any significance to his unconventional character design.
Though Mobile Suit Gundam: The Witch From Mercury had a Prologue episode and an online short story separate from the actual show, this will be the first piece of media in the universe completely separate from Suletta’s story. The Prologue focused on the Vanadis Incident, which took place when Suletta was a child. The short story is also set during that era.
Mobile Suit Gundam: The Witch From Mercury is available for streaming via Crunchyroll, and the side story will start in Spring 2023. Incidentally, the second season will start in April 2023.