“Struggling through the trial of moving the massive boulder, Wynn encounters a baby ‘Gora Turtle’ who got lost”
“While looking after it during their rest, something similar to a motherly instinct begins growing”
“Will they be able to find ‘Gora Turtle”s family?…”

The episode premieres on February 20th, at 19:00 JST
(The English description for the video lists the premiere date as February 23rd)

Source.

Finally, a comment by Wynn’s voice actor, Yurika Kubo:
“I’m super happy about being able to enter the world of ‘Yu-Gi-Oh!’ through the role of Wynn, the Wind Charmer.
When the 4 of them are together, Wynn is enveloped by a gentle environment, like a little sister to them. Watching her being animated makes her even more adorable!”

Source.