At minimum Miyako was probably not the right person to have try and read it. She was the one who wrote in the snow "Love & Piece."
If you write a name in it, that person will die.Even though the explanation is written in english, the most popular language in the human world...Hey, not everyone speaks English you know!That's right. They'll definitely be killed!Here's your notebook back.Here, you take it.That notebook is a "Death Note".Nobody can escape from the "Death Note".And it's so easy too. No one will ever be able to find out you had anything to do with it!