The summary is:
The user tells a story about how they went to visit their grandmother in a village that was cursed by a black witch. The villagers turned into monstrous creatures at night and tried to attack the user, who managed to escape with the help of a stranger. The user learned that their grandmother was a white witch who kept the creatures in check with a bouquet of herbs, but the creatures stole it and killed her. Now the creatures are free to roam the world and hunt for prey.
Here are the key facts extracted from the text:
1. The narrator was studying at the university and had to go to the village to help their grandmother with her household and eye operation.
2. The grandmother warned the narrator not to open the door or windows at night and not to touch the bouquet of herbs hanging at the entrance.
3. The narrator encountered a man who claimed to have a flat tire and asked for help, but the narrator refused to let him in.
4. The narrator saw a neighbor turn into a monstrous creature and attack the man, along with other villagers who also transformed.
5. The narrator escaped from the house and was taken to another village by a truck driver, who told them that their grandmother was a white witch who kept the curse at bay.
6. The narrator's grandmother died after someone stole her bouquet of herbs, which was an amulet against the creatures.
7. The narrator implied that the creatures were now free to roam the earth and hunt for victims.