Abstract
This study evaluates the implementation of in-class extensive reading among Japanese language learners at Vietnam National University, Hanoi. The implementation was found to contribute to students' vocabulary, grammatical knowledge, and reading comprehension, while also providing a positive affective learning experience. However, challenges such as time allocation and the difficulty level of reading materials were also identified. By analyzing the benefits and areas for improvement, this research offers foundational insights to enhance future in-class extensive reading practices and optimize lesson and student outcomes.