This study investigates whether Japanese university students' motivation to communicate in English was enhanced through the application of content and language integrated learning (CLIL) practices. Fifty-three non-English majors took a CLIL English class that utilized massive open online course (MOOC) content for a semester. They gave presentations on the MOOC of their choice after watching lectures for a certain period. A questionnaire on second-language (L2) willingness to communicate (WTC) and international posture was administered three times throughout the semester. Analysis of variance showed significant effects on the factor having things to communicate, whereas L2 WTC and other elements of international posture did not change significantly. A qualitative analysis of students' comments on classes indicated that allowing students to learn topics of interest to them and giving presentations boosted having things to communicate, intercultural approach-avoidance tendency, and L2 WTC. Based on these results, the author discusses the importance of students' autonomy in learning topics and the necessity of longitudinal research and increasing opportunities for students to speak English in useful and authentic ways.