This paper reports a practice on a content-based seminar to deepen Japanese intermediate-low learners' understanding about Japanese novels, and shows the change of learners' confidence and motivation by questionnaire. Students read various short novels, from graded readers to authentic materials, and discussed the contents and shared feedback with classmates. Also, at the end of the semester, they did Extensive Reading of graded readers and had a "Biblio-Battle". The result of the survey shows that these activities have helped leaners gain confidence in reading Japanese and motivation to learn Japanese.