Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A great starter for any beginner in Katakana

This book is not only very simplistic and fun to read. Which in my eyes makes it a great study guide and refference. This book really allows you to learn and read Katakana from the very first day not in fact from the very first hour. The book is set up so that every chapter gets a little bit harder but not impossible to learn. A worthy addition to anyone really seriously interested in the study of Japanese.