A 5 min mostly black and white rough line-art animation of a kid, some baby chicks in various states of living and dead, and a skeletal personification of death (a grim reaper). The plot is pretty much the title. An animation presenting the mere notion of a child facing mortality, not in what he has any emotional attachment to, like say a parent, no can't have any emotional weight in this emotionless short, just some random dead bird he only just encountered. Like watching a kid stare blankly at a dead fish for 5 mins. Painfully boring. What other emotion could this possibly elicit? The synopsis MALhas here is a bit off: The chicks are not in some devious way being sold to die immediately, they are mortal and so will naturally die eventually as that's mortality, but the kid deliberately chooses to buy a sick one that is already going to die soon to stop Death from putting it out of its misery.
And MAL's synopsis is also an interpretation of the short as merely symbolic to ignore the supernatural elements in favor of a solely realistic explanation: The red string of fate is a very specific choice here and would be inappropriately excessive in the final scene merely to convey the kid carrying its memory with him when that would've simply been conveyed already by it following after him without the string. It is used here to convey that their fates have been linked after making that deal with Death. One would not be wrong to infer from the many presented parallels between the kid and the chick some pressing mortality in the kid himself for why he is so concerned about saving a sick chick from dying. And thus the final scene alludes to the eventuality of both going away together in the afterlife.

I suppose the moral of the short is, similar to the Merchant of Venice, that try as you might to bargain with Death, mortality comes for everyone just the same. The bird cannot be saved from its mortality any more than the kid, but there is value in the attempt and such interactions.

There are some decent (and even meaningful) attempts at cinematography, however the crude art style makes most all of it visually uninteresting (in addition to many overly rushed flashes of frames you have to tediously pause frame by frame to catch).

2/10 (where 5/10 is average) I'd recommend reading The Maker of Moons short story (within the short story collection book of the same name) instead if you want to see this story done better.