“Hysteria” might be the most unlikely romantic comedy of the year — if not the decade.

It’s the story of two Victorians falling in love, at the same time one of them invents the vibrator. Plenty of women, certainly, are grateful to Dr. Joseph Mortimer Granville for his work circa 1880. But it isn’t his invention that earns the doctor the love of a good woman; it’s his spiritual awakening, not, shall we say, his medical one.