This paper tackles enhancing outside-class learning of JSL (Japanese as a Second Language) learners. The objective of this study is to examine the effectiveness of our developed learning log system called SCROLL (System for Capturing and Reminding Of Learning Log) in terms of boosting up outside-class learning time of JSL learners in Japan. In our evaluation, there was a statistically significant increase of outside-class learning time during the phase with SCROLL. However the number of uploading words did not contribute to boosting up outside-class learning time but it seemed taking quizzes that contributed to the increase. The questionnaire survey shows that no advanced learners gave positive comments about SCROLL, while there was only one negative comment from the beginners. It implies that the system might more fit beginner learners.