This paper proposes ComicFaves, the system enabling users to organize their favorite comics in bookshelves format. Organizing comics in the form of bookshelves, which is different from the favorite list in conventional comic applications, enables us to understand users’ preferences visually and intuitively. In the user test, multiple users arranged bookshelves based on some themes. We conducted a basic analysis of the characteristics and trends of the bookshelves. The result suggested that bookshelves for affective keywords more strongly reflect users’ individuality and affection than bookshelves for genre information. Moreover, it was suggested that the arrangement of comic titles on bookshelves helped us to understand differences in users’ preferences and sensibilities. It is expected that the features obtained from bookshelves could be applied to develop a novel feature space for comics reflecting readers’ affection.