Let's Do It Already!, Vol. 6: Volume 6

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 familyproducing a line of prime ministersdoes 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? The couple has finally headed off on their romantic school trip. But Yuri gets ahead of herself and gives Keiichiro a kiss on the forehead, which suddenly triggers the Katsuragis into high-alert mode! Keiichiros older brother, Shotaro, arrives on the scene. At first the couple thinks hes come to give them a scolding, but something is off about the way hes acting!