I saw that there was some discussion about this book in the 📚📚 Read every day challenge - Spring 2022 🌸 🌱 thread (start at @omk3 comment here and work your way back through the replies in case you missed it and are curious).
I saw that @sycamore remarked the following:
That got me wondering: is this book aimed at kids? The language (and the content so far) seem pretty simple.
And a more general question in connection to that: is there an easy way to find out the target demographic of a Japanese book somewhere? (Without trying to parse complete Wikipedia pages in Japanese 
)