It was the first day of summer, the day when Kissho Academy students got their first day holiday. Natsumi, Fuyuki, Keroro and his subordinates (except Tamama and Dororo) were sitting on the sofa. They discussed about their holiday plan. However there were still some different opinions, making the discussion wasn't so fruitful. Natsumi wanted to see some beautiful views while Fuyuki wanted to have an occult adventure. The frog-like aliens, they just went with the flow.

While they were debating, the phone rang. It was Natsumi who answered the call. It was a call from Momoka. She would like to have a short conversation with Fuyuki. Natsumi gave the phone to her brother and Fuyuki started to talk to Momoka.

"Fuyuki-kun, do you have any free time tomorrow?"

"Yes. You can visit us at about 9 a.m. What's up, Nishizawa-san?"

"I wanna show you an exclusive thing which I won from an auction last weekend. Actually, I will let you have it, if you like to."

"Well, can I get a spoiler?"

"You will like this for sure, trust me. See you tomorrow!"

Natsumi asked Fuyuki about his talk with Momoka on the phone. She had already had a very high expectation; she was so pumped up to see what that thing actually was. "Unfortunately, she refused to give me any spoiler," said Fuyuki.

When Kururu was just back in his lab, he received a message from Saburo. He also wanted to have a visit at the same time as Momoka's visit. Kururu directly accepted his request without asking the Hinatas for permission.

Five minutes to nine on the next day, someone pressed the doorbell. Fuyuki opened it and welcomed the first guest arrived. It was Saburo. "What are you doing here?" asked Fuyuki kindly. "I have an appointment with Kururu. But first, I wanna greet you and your sister," he answered. "Nice to meet you again, Saburo-san. Please, come in!" welcomed Fuyuki as they shook hands.

Saburo was eating Natsumi's homemade cake when the doorbell rang once more. Again, Fuyuki opened the door and told Tamama and the rich girl with a gold-colored box to come in. Momoka was smiling and furious at the same moment as she saw Saburo amongst them. "SHIT! Why is there another guest here?!" thought her dark personality.

"Natsumi-chan, Fuyuki-kun, excuse me. I have to go to Kururu's lab now," said Saburo as he went down to the basement.

"Keroro-san, do you mind if I use your room for a while? I don't want anyone see this from outside," persuaded Momoka. "No, I don't mind. Hey, can I and my whole platoon see what's inside that box?" replied Keroro. "Can I join with you guys?" asked Dororo who suddenly appeared from the ceiling. She nodded and they all went to the sergeant's room.

Momoka opened the box and showed them the thing inside the box. It seemed to be a wooden crown with red leaves and berries on it. Fuyuki, Natsumi and the aliens were amazed; their eyes gazed directly to it. "It's a licensed replica, actually. The leaves and berries are fake, of course. This thing is not the original one used in the movies, that thing (the original one) was sold before I joined the auction," the auction winner explained.

"Fuyuki-kun," she called. "I know, your name represents winter. But, uh... there are only spring and autumn crowns. So, I chose the one that represents the season before winter because spring is too... contrast. Take this, it's yours now," she said as she handed over the crown to the boy she had a crush on.

"I can't accept this, Nishizawa-san," he answered. "You had to pay a big amount of money in order to get this crown." Without hesitating, Momoka put the crown on his head. She asked Natsumi, "Does your brother look like a king?" Natsumi answered, "He only needs to dress like a mighty king to perfect his appearance!" Despite Natsumi's compliment, Fuyuki chose to humble himself. "I guess, I'm not a suitable person to be a king."

Meanwhile, Kururu and Saburo were in the lab. The curry lover had just made a teleporter device which could transport whatever inside it to another location (fictional universe and other places similar are not included) instantly.

A few moments later, something went wrong with the device unexpectedly. Eventually, it blew up enormously. Not only Kururu and Saburo, but also the ones in Keroro's room were transported to somewhere else separately.