In the near future, when young people in Japan turn sixteen, the government assigns them a marriage partner. The program analyzes the genetic information of its residents and selects a marriage partner for them. People don't have to go through the trouble of looking for someone, and everyone accepts that the country is going to find a compatible partner to make them happy. Aoi Nisaka is a high school student. She is in a love triangle with her childhood friend Yuto Shiba and Sosuke Takachiho. Sosuke Takachiho is appointed by the government to become her husband.