E☆2 frontier Vol.7の高価買取価格

It looks like you're referring to a book titled "E☆2(えつ) frontier Vol.7," which is part of the Media Pal Mook series. The ISBN you provided (9784802157025) can be used to identify the book for purchasing or library purposes. Unfortunately, I don't have access to specific content or details about the book itself, but you can typically find more information by searching online bookstores, library catalogs, or publishing websites. If you have specific questions about the book or its contents, feel free to ask!