A prince from a certain country has come to Japan on a secret visit! Koi, the beautiful secret service girl who has been assigned to guard him for three days, thinks she'll just be there to look after the child. However, the blonde prince is actually a perverted prince with a harem in his own country, and as a security guard, she can't resist important people, so she uses her position to sexually harass Koi as much as she wants! She forces her to take a bath with him and sneaks into his bed. How long can Koi, the beautiful secret service girl, endure the prince's pranks?!