The demo retells the Elric brothers' story in 110 words, drawn in the Anime style across eight scenes. It lasts 46.6 seconds, about 2.4 words per second. Will, the friendly young American narrator, reads it; captions use the BEAST preset with each spoken word picked out in yellow; and the music sits at 20 percent volume.
It cost 20 credits: 10 for the 30 to 60 second video and 10 for AI Motion Video on the opening scene. On the free plan you could make the same video with that first scene as a still, for 10 credits.
The script hits the right beats: the forbidden transmutation, the search for the Philosopher's Stone, the homunculi. One detail is simplified. It says Edward loses an arm, but in the story he loses his left leg in the failed transmutation, then gives his right arm to bind Alphonse's soul to the armor. That second trade is the most powerful image in the series, and fans will quote it back at you.
In your version, keep the two losses separate and give each its own scene. Then end on a question the brothers' story raises, such as what you would give up for someone, instead of asking viewers to like and share.