treat htmlversion/epubversion as integer
treat htmlversion/epubversion as integer

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