Kaito-sama to, Saraware Hanayome

A rich daughter, Mari, was about to be forced into an unwanted political marriage due to her family's circumstances. However, she was kidnapped during the ceremony by Phantom Thief Nero, who suddenly appeared at the ceremony hall. Knowing that Nero is actually a phantom thief to save the weak, Mari gradually becomes attracted to Nero's personality. Mari decides to abandon her home and work with Nero, but...?