Matenrou Opera (摩天楼オペラ) is a Japanese symphonic metal band formed on October 2006 by Sono, the talented former vocalist of Jeniva. When Jeniva disbanded on October 14, 2006, Sono and fellow Jeniva drummer Yuu began working on their new band. All the members were already chosen before Jeniva finished disbanding. The name of the band was kept a secret until 23rd of February, when Yuu finally announced that it was Matenrou Opera, inspired by the anime "Blood+".