This thesis looks into the use of language by girls in six Japanese TV animations for kids. The study shows that there is a gap in the use of female sentence-closing particles in a sense that the use of the particles is decreasing in reality while they are used a lot by girls appearing in animations. A survey was conducted on Korean Japanese learners to understand their perception of this phenomenon and it was compared with native Japanese speakers. The results are summed up as follows. First, those who have a higher level of JLPT have a similar level of knowledge about gender differences in the Japanese language to that of native Japanese speakers and their understanding is lower in female languages than in male languages. Second, native Japanese speakers perceive those who use female sentence-closing particles are mainly in their 20s and 30s while Korean Japanese leaners perceive them to be in higher age brackets, especially those who use wa sentence-closing particles. Third, native Japanese speakers feel a sense of incompatibility when female speakers use female sentence-closing particles in reality but feel less of it about the use of the particles in animations. Also the sense of incompatibility is felt greater among Korean Japanese learners with higher levels of JLPT. The language level is proportional to the viewing rate of Japanese animations and those who view Japanese animations more have more knowledge about female sentence-closing particles and find the use of them more incompatible.