Although the Takarazuka Revue is technically a musical company, its founder's ambition was to create a uniquely Japanese form of opera or operetta, merging elements from Western and Japanese forms. Like opera, and unlike musicals in general, trouser roles play a central part in the all-female Takarazuka Revue, and are typically cited as its main appeal. Research from a Japanese-studies perspective tends to discuss the Takarazuka Revue trouser roles, otokoyaku, as a gender-reversal of all-male kabuki, or put them in the context of androgynous or cross-dressing Japanese idols. This article addresses their connection to trouser roles in non-Japanese music theatre, specifically opera. It does so through three lenses: first, the Takarazuka Revue's opera loans and adaptations; second, the shared aesthetic appeal of trouser roles in these two theatre forms; and finally, the singing styles employed in the Takarazuka Revue, including their change over time and relation to classical singing.