His rule: No sexual relations until age 18! Her rule: No rules. Free-spirited Yuri Hasegawa and straitlaced Keiichiro Katsuragi have fallen in love. But his elite political family--producing a line of prime ministers--does not allow male descendants to engage in any sexual relations until they are 18. Can the physically affectionate Yuri and rule-abiding Keiichiro keep their relationship strictly chaste? Yuri and Keiichiro are up against the final boss--Keiichiro's grandfather--who gives them an ultimatum: choose the girl or leave the family. Yuri and Keiichiro are driven into a corner, but weren't they meant to be together?!.