cover needs another ID for ePUB3
cover needs another ID for ePUB3

kuad9/review_study,masawada/review,krororo/review,kmuto/review,kmuto/review,suzuki/review,murashitas/review,takahashim/review,masawada/review,kmuto/review,krororo/review,orangain/review,suzuki/review,krororo/review,kuad9/review_study,takahashim/review,orangain/review,murashitas/review