This DVD, "The Secret," explores the secrets of the universe. - Title: The Secret - Format: DVD - Language: Japanese - Bonus Features: Included This is a set of the Japanese DVD and CD (soundtrack). The content of the book is presented through video and audio. Having been watched a few times, there may be minor scratches from use. I am selling this to declutter. You can gain information in a different way than reading the book, so it's also recommended for those who already know the content from reading the book. Thank you.