When Koyuki, the new student in school, instantly falls in love with Natsumi, the secret of the Hinata family might be in jeopardy! Koyuki claims to be from the country, but she's really a special agent with a direct line to the Fifth One! When she moves in next door to the Hinata household, she finds that there's something a little bit alien about the family. One thing's for sure: The strange and beautiful Pokopen is turning out to be quite a frog-eat-frog world!