Hanayome wa 16-sai

Left alone and a high-school dropout 16-year-old high Natsumi was given an offer she can't refuse, to pose as the 19-year-old bride Sayuri, heir to a major corporation, in order to ensure a smooth merger between two companies.
Natsumi has to live as Sayuri, her look-alike, and marry the man sayuri was sposed to marry,
for two months in return to receive a large sum of money. (Source: MDL)