Nanki-Poo, the son of the Mikado, is head over heels in love with Yum-Yum, and he is willing to lose his head to marry her! But, whilst Katisha is trying to claim Nanki-Poo for herself, Yum-Yum is about to be married to Ko-Ko …! The Mikado, meanwhile, is ordering that heads must roll in Titipu! Will anyone keep their head in this crazy, colourful, classic comic opera?