Lately, a mysterious rumor has been circulating in our school library. — "If you sneak into the library after night self-study, there's a Row X. At Row X, Slot 0, there's a book that isn't visible during the day. The title of that book is..." — According to the kids, if you read that book and follow the rules on the first page, your desired dream will come true. For someone like me, who loves mysteries, is introverted, has no friends, and just drifts through daily life, this is quite interesting. So, I'm going to the library today to find that book.