This paper attempts to reinterpret asylum theory (1954) propounded by Ortwin Henssler (1923-2017) as a free-space theory of education, as a way of grasping the problematic nature of 'pedagogical protection.' The theoretical potential of Henssler's thought has been more appreciated, accepted, and developed in Japan than in his native Germany. First, I outline Henssler's theory of asylum and show how his theory has been received and developed in Japan, especially in the fields of historical researches. Secondly, I discuss the possibility of reading Henssler's thought of asylum as a theory of 'pedagogical protection.' Thirdly, I consider whether it is possible to interpret 'free space' in education based on the model of asylum. Finally, I delineate some prospects for and challenges involved in connecting the theory of asylum to the theory of education.