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 have gotten to know each other on their daily commute to their respective high schools. Yuri makes a passionate love confession to Keiichiro, and he feels the same! Yuri rushes in to kiss her new boyfriend, but...!