This audio book attempts to teach you basic Japanese by following a kooky story in which you are recruited as a spy to find out why a group of wannabe fans who love a show similar to Power Rangers has taken over a Japanese theme park. Interspersed with the story are lessons that teach you basic Japanese. It is a fun book to listen to, but it does go very fast through the Japanese. You may have to repeat parts often in order to learn the Japanese. Otherwise, this is a novel idea that is very enjoyable. If you like it, the author also has an audiobook about learning basic Mandarin Chinese as well.
For those who want to expand their knowledge from Vol. 2. As with all audio lessons on a language, it is necessary for the listener to have some knowledge of the language already, to really get the benefit. I found the content to be practical for a person wanting to visit Japan and get by on a basic level. I enjoy the music and the voices used. I'm a fan of the earworms series.