Once upon a time, there was a magician named Logic who held the magic book, Knowledge of the Entire World. With this book, anyone can gain knowledge with a blink of an eye, but must give something equivalent in exchange for what they wish for. One night, the magician appeared in front of a girl and started the trade....
“A blink of an eye -- the moment when you understand what you really want, I give you this (wish) -- without any exchange.”
