What makes Nocturnal Opera by Moi dix Mois notable?

'Nocturnal Opera' was well-received in Japan and contributed to Moi dix Mois's reputation, solidifying their presence in the gothic metal genre. The album's intricate blend of styles led to increased interest from international audiences, influencing other bands in the visual kei movement and beyond. By the release of 'Nocturnal Opera' in July 2004, Moi dix Mois had established themselves as a significant act within the Japanese gothic and symphonic metal scenes. This album marked their third release, following the well-received 'Dix Infernal' and showcased their growing complexity in sound and composition as they explored darker themes.