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Request Method:	GET
Request URL:	https://ewww.kumamoto-u.ac.jp/ch/prospective/undergraduate/exchange/ewww.kumamoto-u.ac.jp/media/medialibrary/2016/01/KU_Short-Term_Exchange_Program_WEB.pdf/

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.