In the near future, when young people in Japan turn sixteen, they are assigned a marriage partner by the government trough a program called The Red Threads Of Science. People don't have to go through the trouble of looking for a marriage partner and everyone accepts that the government will find a compatible partner to make them happy. Yukari Nejima is fifteen years old and turning sixteen. He lives in a small corner of the country, and just can't seem to get ahead in life. Both academically and athletically, he's below average. But in within him, he hides a heart burning with passion! In this world in which love is forbidden, what will happen to him when he falls in love?