The story is set in the future Japan. In order to solve the problem of low birth rate, the government prohibits free love and changes it to a state of full government control. Every teenager who reaches the age of 16 will be assigned a partner by the government as a love partner. This is the best candidate matched after precise calculation. Yukari Nejima (voiced by Ryota Oosaka) is a 15-year-old boy. He has a very ordinary personality and appearance. He hides a secret in his heart. That is, he has silently liked a girl named Takasaki Misaki (voiced by Hanazawa Kana) since elementary school. However, this love is illegal in this twisted society. Lirina Sanada (voiced by Yui Makino) is the perfect girlfriend assigned to Yukari Nejima by the government. However, when she learned about the relationship between Nejima and Misaki, she decided to help them hide the secret and fully support this beautiful and pure love.