At the Yogobama Familia Church, Claris, the princess of Marlow Kingdom, is to wed Pero Gully of Ripa Kingdom. The members of G4 are sent to guard her, but are surprised to find that she looks just like Sheryl. Meanwhile, the continuing rain has made the humidity in the attic 100%, and Milky Holmes badly wants a dehumidifier. Claris begs Sheryl to take her place, so she can enjoy what she's always wanted, "being a normal girl." Lured by the prospect of a free dehumidifier, she accepts, but Prince Pero Gully has a strange fetish...

An elementary school girl named Aileen has gone In the Yokohama jungle behind Holmes Academy. Milky Holmes and G4 go looking for her, but Sheryl and Akechi go missing too. The search is temporarily caled off, but the rest of Milky Holmes goes looking for her without permission that night. But they're captured by the Gentlemen Thief empire. Meanwhile, Sheryl and Akechi meet Aileen inside a cave. They hear why she came here, and vow to save her. The next day, the three of them try to escape...

The Gentlemen Thief Arsene sends the police a letter about a crime she's going to commit. She's going to steal the "Venus of Hama" in the Super-Yokohama Art Museum. Akechi,Zenigata, Hasegawa, and Tooyama head to the scene. They're the members of the Yokohama Police's anti-gentlemen theif team "G4" The members of Milky Holmes also rush to the museum to meet G4. Akechi feels that they're her rivals, and comes up with a plan. If they do as she says, their lost Toys will come back. Believing her, Milky Holmes does a game inside the art museum. But Elly can't take the embarrassing pose she has to perform, and runs away! And then, the Gentlemen Thief Empire finally appears!

With their Toys gone, Milky Holmes are forced to live in the attic. Their food is barely edible, and they gradually become more and more depressed. Twenty, Stoneriver, and Rat of the Gentlemen Thief Empire watch them and laugh. They've changed their names to Nijuuri, Ishinagare, and Nezu to keep an eye on Milky Holmes. But just as Milky Holmes is on the verge of falling apart, they're saved by a young kitten, Fish-Paste. The group starts to come together, but then the morning bread is stolen! Ishinagare accuses them of being the crooks. Milky Holmes is in big trouble!

Milky Holmes seem to have lost their powers: their Toys. What will happen at the academy when they arrive?