Hayate the Combat Butler, Vol. 1

Hardworking Hayate has a plan to pay back the yakuza, who are now the legal owners of his vital organs: he'll kidnap someone and ransom them for a mountain of money! But things get tricky when his would-be kidnappee is the daughter of a wealthy family. She mistakes Hayate's actions for a confession of love, and hires him to be her personal servant.