A picture book that teaches the rules for improving communication skills. - Title: Rules of Words - Author: Supervised by Yuko Yoshida, Manga by Akari Futaba - Publisher: Ikeda Publishing - Content: A book that levels up your communication skills - Price: 950 yen (excluding tax) I bought it new and read it once. It contains a lot of information, and I thought it would be helpful for adults too. Thank you for looking.