Monochrome Heaven

Monochrome Heaven is a otome visual novel released in 2009.

The setting is near future: an Asian country called Kagoku, a city named Higashito. In this bleak, gray city ruined by war, a poor flower-selling girl is purchased from her family by a wealthy young businessman. What does he want with her? To find a bride in the next two weeks before his 25th birthday -- the day when, unless he finds a loving wife, he's cursed to die...