The purpose of this study is to analyze the utilization status of the Comprehensive Support System for Reading Education and other Online tools to draw implications for its improvement. The levels of utilization of the system before and after the COVID-19 were compared, in order to analyze the degree of support and the level of contribution of the system to school library education in the COVID-19 situation, where the online platform utilization has been maximized in elementary and secondary education. A questionnaire survey was conducted among teacher librarians to compare the perceptions of the overall online tools and the utilization of the system in the school library education before and after the COVID-19. Requirements for the better system primarily based on teacher librarians’ opinions were analyzed. Based on these, it was possible to discover necessary implications for the improvement of the system in order for the system to function as an online platform for school libraries.