In recent years, viewer ratings among young people have dropped and production costs (such as checks for historical accuracy and licensing for the use of related data, production and procurement of sets and props, securing of locations and related licensing, plus costs and labour involved in makeup, wigs, costumes) have increased compared to contemporary dramas.
近年、若者層の視聴率が取りにくい事や現代劇に比べ制作費がかかる（時代考証、およびそのための資料引用に関する許諾、大道具・小道具等の制作や調達、ロケ地の確保やそれに伴う許諾、化粧・鬘・衣装等の製作費用や手間...等）。