Group investigation is a type of cooperative learning which focus on student participation and activity. This research aims to describe the implementation of group investigation on Japanese language learning in Senior High School and to investigate about the responses of students towards group investigation. The samples of this research are 32 students of X IIS 2 SMA Negeri 2 Yogyakarta. The data of analysis technique were used are observation, questionnaire, and documentation. Based on the research result, there are four parts of group investigation on Japanese language learning flow, introduction, core activity, final core activity, and closing. After the Group Investigation was applied, the learning be more practical and students became more active. Therefore, the implementation of group investigation is an appropriate method to used on Japanese Learning in Senior High School.