The research aimed to describe the errors and factors affecting errors made by learners in writing hiragana letters involving the elements of the word sokuon and choon. It also described the way to resolve errors made by the teacher and learners. This study was qualitative descriptive research, which was conducted in SMAN Rengat involving 20 Japanese language students of grade ten. The collected data were in the form of tests on choon and sokuon and interviews. It was ten questions for each session. The interview aimed to support errors and mistakes. The results show that the highest error in sokuon part was about 80% which was divided into 60% of errors and 20% of mistakes. The highest error in choon part was 75% which consisted of 55% of errors and 20% of mistakes. The lowest number of errors was 5% in choon and 35% in sokuon. The errors occurred because of students' lack of knowledge about choon and sokuon. The mistakes were more caused learner by less focus when students answered the questions provided. Besides, it was discovered that learners forget about the vocabulary in questions. To fix the errors, the students were helped by the teachers who gave more exercises of hiragana letters and became more creative in the learning process by using relevant media and various sources. Also, learners could do more exercise in reading and writing of hiragana letters, especially choon and sokuon in order to minimize the errors.