This study explored democratic citizenship (DC) for students by developing a DC framework (DCF) with eight components. We employed the DCF to examine what and how much DC was included in Korean science textbooks and lab books focused on the topic of energy for Grades K-12. We found different DC components were included at different grade levels and some components were not present at all. To help address the uneven distribution of these components, we developed four DC inclusive science, technology, engineering, arts, and mathematics (STEAM) books related to the topic of energy. These books were designed with the DCF to foster rich DC learning experiences in school science. We engaged 13 teachers as consultants in a validation process when developing the DC inclusive STEAM books. This study describes the development and implementation of the DCF for preparing supplemental science curriculum materials that can improve students' appreciation for DC.