This is a vocabulary book for English beginners, with an app that helps you learn 4000 words efficiently. - Title: Kiku-tan Basic 4000 Word Level - App Compatible: booco app compatible - Target Level: Beginner to Intermediate English - Price: 1,540 yen - ISBN: 978-4-7574-3347-2 Thank you for looking. I bought this in high school but barely used it. I'm selling it to clear out my belongings.