This study examines which media incorporated in a developed Computer-Aided Instruction (CAI) will be useful for the students taking up Nihongo classes. The CAI program was developed using a tutorial mode of presentation covering basic greetings, sentence patterns, number systems and hiragana characters. Each of these topics will have the following media in the flash lectures: text only, text-graphics, text-graphics-sounds and text-graphics-animation-sounds. Students in class were divided into four groups: the first group used text only media; the second group used text-graphics; the third group used text, graphics and sound; and the last group used text, graphics, sounds and animation. Examination was administered at the end of every lesson. ANOVA was used to determine the significant difference in the performance of students using different types of media. From the four media types of Flash lessons embedded in the system, the most effective media were text with graphics, sounds, and animation. Animations with the right text, graphics and sounds are a useful aid in making lessons meaningful for students.