No, that isn’t a typo in the headline: A new trailer for Honkai Star Rail introduces March 7th to the public.
As for the game itself, Honkai Star Rail will involve March 7th as well as other identified crew members like Welt, Himeko, Dan Heng, and possibly Carole.
Lacking her original name, she opted to name herself after the date she was saved: March 7th.
A clever, eccentric girl with an unusual name, March 7th travels with the Astral Express.
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March 7th Trailer - "Let's Take a Photo!" | Honkai: Star Rail