The official website of the anime revealed a new image of the main character, Suletta Mercury.

Mobile Suit Gundam: The Witch From Mercury Prologue will make its debut on July 14 at the Gundam Factory Yokohama, the life-size Gundam Unicorn statue in Tokyo's Odaiba, the life-size Freedom Gundam statue in Shanghai, the life-size RX-93ffv Gundam statue in Fukuoka, and the upcoming Gundam Base Virtual World in Bandai Namco Group's planned Gundam Metaverse project. Later, the project will make its debut at events in Japan and around the world.

The following is how the story is described on the anime's website:

A.S. (Ad Stella) 122―

An era when a multitude of corporations have entered space and built a huge economic system. A lone girl from the remote planet Mercury transfers to the Asticassia School of Technology, run by the Beneritt Group which dominates the mobile suit industry.

Her name is Suletta Mercury. With a scarlet light burning in her pure heart, this girl walks step by step through a new world.

The anime's characters and mobile suits are as follows:

Suletta Mercury, a second-year student in the piloting department, who transferred to the school from Mercury. Suletta is timid and somewhat lacks communication skills. She is the pilot of the Gundam Aerial developed on Mercury.

Guel Jeturk, an heir to Jeturk Heavy Machinery, one of the group's three branches, and a third-year student in the piloting department. Guel has a rough temperament and is quick to anger. As the ace pilot of Jeturk House, he has absolute confidence in his own skills.

Guel's Dilanza

Elan Ceres, the top pilot backed by Peil Technologies, one of the group's three branches. A third-year student in the piloting department. Elan is a taciturn and solitary person, who doesn't open his heart to anyone in school. He has an interest to Suletta

Gundam Pharact
Miorine Rembran, an attractive and academically distinguished second-year student in the management strategy department. Miorine is the only daughter of Delling Rembran, the president of the Beneritt Group and chairman of the school's board. She has a strong rebellious feeling towards her father.

Shaddiq Zenelli, an adopted child of the CEO of Grassley Defense Systems, one of the group's three branches. A third-year student in the piloting department who leads Grassley House. Although still a student Shaddiq has shown his skill in business too, he is a candidate for next generation executive.

Michaelis