

If you are trying to open this file, you will need a utility like 7-Zip or WinZip to extract its contents and see the "story" inside.
A 7-Zip file containing a visual novel, a game's story assets, or a collection of digital stories. MAIS.7z
It is highly probable that this refers to one of the following: If you are trying to open this file,
Wikipedia notes that 7-Zip is an open-source tool used for high-ratio file compression. a game's story assets
The search results indicate that likely refers to a compressed archive file (with the .7z extension) named "MAIS." However, there is no widely known viral story, game, or cultural phenomenon specifically titled "MAIS.7z" in general public databases.