A possible concise summary is:
A boy named Nico goes to the beach with his friends and gets turned into a merman after swimming in the ocean. He meets other mermaids who invite him to join their club and live in their castle. He participates in a ring race game and wins a prize that gives him merman legs. However, he loses his ability to communicate with the mermaids and returns to the shore, where his friends don't remember anything. He wonders if it was all a prank.
Here are some possible facts extracted from the text:
1. The text is a transcript of a video from the YouTube channel "MooseCraft".
2. The video is titled "I Became a MERMAID in Minecraft! (Minecraft Mermaid Mod)" and was uploaded on October 9, 2021.
3. The video features four main characters: Nico, Cash, Zoey and Sandy, who are friends playing Minecraft together.
4. Nico gets turned into a merman after swimming in the ocean and meets other mermaids named Donald, Chloe and Tammy.
5. Nico participates in a mermaid game called ring race and wins a prize of merman legs that make him swim faster but lose his ability to communicate with the mermaids.
6. Nico returns to his friends on the shore and finds out they don't remember anything about the mermaids.