This case study is targeted at the Japanese learners in Taiwan which participated in short-term training in Japan in July, 2013. The questionnaire was carried out to them in order to clarify the following:Through their experiences in Japan,1. How did they master/improve Japanese?2. What kind of consciousness did they hold to Japanese?The main conclusion is the following:1. During the training period, learners increased the vocabulary of Japanese to be used, and tried to change their pronunciation, and noticed the difference between the grammar of their mother tongue and that of Japanese.2. In communication with Japanese in Japan, they tend to focus on the appropriateness rather than the correctness.3. Many of the learners are positive in learning the dialect. The reason is that the dialect plays an important role in the actual oral communication in Kansai area, and this fact is recognized by them through their own experiences.