Used. Set of 12 books. Challenge 6th Grade Shinken Zemi Elementary Course Supplementary textbook: Mirai Hakken BOOK (Future Discovery BOOK) My child has successfully graduated, so I am selling these. I think they are relatively clean, but there are some minor folds and scratches. There is no writing inside. #Challenge #6thGrade #ShinkenZemi #MiraiHakken #MiraiHakkenBOOK #SupplementaryTextbook #PreparationForJuniorHighSchool #PreparationForOverseasAssignment #OverseasAssignment