In a small Japanese town, Ko-Ko is appointed to the unenviable position of executioner. Knowing he must successfully perform before the appearance of the Mikado in a month's time, Ko-Ko finds a suitable victim in Nanki-Poo, who is distraught over his unrequited love for the maiden Yum-Yum. Nanki-Poo agrees to sacrifice his life if he is allowed to spend his remaining days with Yum-Yum, who is betrothed to Ko-Ko.

Half-fae-half-mortal shepherd Strephon wants to wed shepherdress Phyllis, but, although she reciprocates his feelings, she has a dilemma — she is so beautiful that all of the House of Lords, as well as her guardian, the Lord Chancellor, are also desirous of marriage.

As a young child, Frederic had been apprenticed to a pirate by mistake when he should have been apprenticed to a pilot. Now, having reached his 21st year, Frederic's indentures are at last over and he happily leaves the service of the pirates. When Frederic meets the beautiful Mabel, one of the many daughters (or wards in Chancery) of Major-General Stanley, they fall in love and decide to marry. However, complications arise when the pirates decide to marry the rest of the Major-General's daughters, themselves - and Frederic's birthdate turns out to be not all it seems.

The story of a little boy named Sam, who is exploited by two evil chimney sweeps to clean narrow chimneys.

Set around a classic case of broken vows – the defendant having literally left the claimant at the altar – the trial bubbles over with emotion, humour, and downright chaos, leaving the jury divided.