Kanji Puzzle

Are you interested in the Japanese language? This puzzle features commonly-used "Niji-Jukugo" words in Japan. The Niji-Jukugo is a two-Kanji -character compound word. If you are not a native Japanese speaker and can answer to this puzzle, you must be particularly interested in the Japanese language. Rules of this game. One Kanji is hidden in the center of the matrix.