Interesting trivia about Katsuki Shizuko

As you know, from the second chapter in the third book of the Time and Space Dimension Cross series, Katsuki was in grade 2 in Teitan Primary School.

It's because of her long stay in America with her parents that made her fluent in English but not a fluent in Japanese, so she goes into grade 2 because the parents thought it was a good decision to refresh the basics of Japanese. In classes such as Math, she would be studying more Japanese rather than doing grade 2 work. I mean, she's supposed to be in grade 5-6 or something.

Katsuki skips schools, in this book, with Chiharu because that Chiharu has taught her all about middle school and high school work. One of the benefits of having a dang smart friend with you.

So, yeah, it's a clarification for this character.

Silence as Deduction/Sweet Silent Death