This application contains "Yojijukugo" (Japanese four character idiomatic compounds) more than 7,000. Completely free, with no time limit, and you can try again and again if you make a mistake. Well, how many "Yojijukugo" can you answer correctly in a month? If you have achieved over 1,000 words and you are amazing. ◆ description of the app I will ask a different idiom randomly from among 7,000 words each time. Correct 4 combinations in one quiz. If you answer correctly, you can find out the me