X

X the Unknown is a letter in Rolypolys no Nanakorobi Yaoki.

Plot

The letter X from the Alphabetical Animals series appears, then latches onto the back of Jumping Jack Bu. Bu tosses it onto the ground and stomps on it. Tatsuro burns it to a crisp and Bu runs away.

Moral

"X the Unknown."

Explanation

"Literally: X the Unknown.

In mathematics, "x" is the symbol for an unknown quantity. It is used to represent anything you don't know. What would you do if you encountered something really strange, like an alien or a ghost? Most of us feel threatened by things we don't fully know or understand. When the mysterious X appeared, Bu - with Tatsuro on his back - got into a fight with it. If they had made the effort to communicate, they might have ended up as friends. When we encounter something new, we should at least take a good look at it and make an effort to understand what it is. Don't you agree?"