新・にほんご敬語トレーニング Shokyuu ga Owattara Hajimeyou Shin-nihongo Keigo Toreeningu

The Definitive Keigo Study Guide
When learning to communicate in Japanese, the study of keigo (polite speech) is unavoidable.
Have you found yourself still unable to master keigo even though you've completed beginner level courses and have studied it a bit? -Material you can use as soon as you complete beginner level courses -JLPT level N3 and above vocabulary words include English, Chinese and Korean translations