Target Friend is a free app developed by Obunsha Co.Ltd. to support learning of the "English word target" series. The app provides a comprehensive list of supported books, ranging from basic to university entrance exam level, to TOEIC preparation. Target Friend offers easy operation and listening in the gap time, helping users test their learning outcomes with a variety of question formats. The app also allows users to check their ability in the national ranking, review the wrong word immediately, and access "Today's 5 questions" in the morning and night to support continuous learning. Moreover, users can overcome words that they are not good at using the "Not good training mode" (in-app purchase) and have automatic management of learning status with "My wordbook" (in-app purchase). Target Friend is a great app for anyone looking to improve their English vocabulary and idioms.