used google translator to translate and here is the recap
Komarisa and koreimu are stray yukkuris, their parents were killed and their house was taken over by other stray shitheads, their will to live was so strong that They encouraged each other and promised to survive, Komarisa decided to hunt so that her sister could live. Knowing that komarisa don't know a shit about "hunting" he remembered that her father always Say that "this trash bags have rotten rice" so that the only thing he know about hunting after walking for a while he finally found a garbage bag, jumping with happiness that he and his sister will survive, with all his might he tries to break the bag despite being a weak koyukkuri he does not succeed but he does not give up Then another stray yukkuris arrives and tells the little one that he is making a lot of noise and that trying to open garbage bags is suicide and that he will end up attracting humans ,little one try to act tough with the yukkuris, dumbass end up getting stabbed to death by the shithead, komarisa died full of pain thinking about her sister, he failed her then we go to look below the vending machine, koreimu has been waiting for her brother already 3 days she is about to die of starvation Her brother promised her that he would come back so she kept waiting , about the die she say "why" and died "the end" it's not bad but it's not very good either
There is a reason why I don't tag shithead in those pictures, Marisa had a reason (and a right one) to do that, as you've already said it yourself, Maricha created noise that attract human, and it maybe killed all of the yukkuri near that place, including direct (mass extermination) and non-direct (starvation from lack of food), so ofc she will gladly killed a strange yukkuri that didn't know the rule and wouldn't hear her suggestions.
End.That facial expression appeared as if it is asking "why?".It ate up its decorations and sideburns and died with a terribly miserable appearance.The stray yukkuri died from the mundane starvation.After that, little sis reimyu continued to wait under the vending machine.Reimyu died 3 days after that.Believing in maricha, it continued to wait, forever.