Here is a concise summary of the provided text:
**Initial Story**
* A mermaid's daughter is accidentally swallowed by a fish, then caught by a fisherman.
* A witch attempts to steal the daughter, but is thwarted by a powerful monk (Sadhu Baba) who protects her with a magical barrier.
* The monk helps reunite the daughter with her mermaid mother, creating an illusion to deceive the witch.
* The witch falls for the illusion and is burned to ashes when trying to snatch the fake daughter.
**Sequel Story**
* A devil revives the witch using a magical machine and the poison of snakes created from mermaids.
* The revived witch demands the devil capture mermaids to eat, restoring her powers.
* The mermaid queen and a companion inform Sadhu Baba, who reveals a plan to destroy the witch:
1. Feed the devil to the machine that revived the witch.
2. Have the witch eat the resulting "devilish fishes".
3. The witch will turn to stone, and destroying the statue will kill her.
* The plan succeeds, and the witch is destroyed, saving the mermaids and the river.
Here are the extracted key facts, each with a number and in short sentences, excluding opinions:
**Storyline Facts**
1. A mermaid gives birth to a daughter in the sea.
2. A witch discovers the birth and plans to steal the daughter.
3. The witch disguises herself as a fish and approaches the mermaid.
4. The witch steals the daughter, but drops her while fleeing.
5. The daughter accidentally enters a big fish's stomach.
6. A fisherman catches the fish and takes it home.
7. The fisherman discovers the crying daughter while cutting open the fish.
**Character Interactions**
8. The fisherman seeks help from a nearby monk (Sadhu Baba).
9. Sadhu Baba discovers the daughter is a mermaid's child using his powers.
10. The witch attempts to snatch the daughter from the fisherman's home but is thwarted by Sadhu Baba's protective line.
11. Sadhu Baba, the fisherman, and children return the daughter to her mermaid mother.
**Later Events**
12. A devil uses a magical machine to bring a witch (in statue form) back to life.
13. The devil captures mermaids to create fish for the witch to eat, restoring her powers.
14. The mermaid queen informs Sadhu Baba about the devil's and witch's actions.
15. Sadhu Baba devises a plan to destroy the witch by turning her back into stone and then breaking the statue.
**Final Confrontation**
16. The witch is tricked into eating fish that are actually the devil transformed.
17. After consuming the fish, the witch turns back into a stone statue.
18. Sadhu Baba destroys the statue, saving the mermaids and the river.