Addie no Okurimono: To Moze from Addie

On the eve of her ninth birthday, a young girl named Addie is gifted a Loglock - a peculiar cipher puzzle that has proven popular among children her age. While excited to transform one word into another using her newfound toy, she soon finds herself lost in a number of real-life puzzles that aren't so easy to solve. That is, at least, until her night is met with a strange dream.