Akiba-kei is a word that describes people who really love anime, manga, video games, and other Japanese pop culture things. It's like being a big fan of something, but for Japanese stuff!
People who are into akiba-kei like to collect things like toys, figures, and posters featuring their favorite characters. They might also dress up in costumes that look like characters from anime, manga, or video games. This is called cosplay.
Akiba-kei is named after Akihabara, a neighborhood in Tokyo where there are a lot of stores and shops that sell anime, manga, and video game things. People who are into akiba-kei often like to visit Akihabara to see all the cool stuff there.
Overall, being an akiba-kei just means you really, really love Japanese pop culture things!