In a Japan facing a declining birth rate crisis, the government enforces the 'Yukari Law' that matches 16-year-olds based on genetics. Yukari Nejima, on the verge of 16, confesses to his crush Misaki Takasaki, only to discover he is betrothed to Ririna Sanada. Caught between love and duty, Yukari navigates a web of emotions and secrets in this tangled tale of romance.