Natsumi seemed to start a new bad habit: going home late in the evening. On Friday, she came home as usual. Fuyuki welcomed her and complained, "Nee-chan, why have you come home late these days? Doing chores and cooking everyday makes me tired!" She replied, "I have to attend some singing rehearsals, even on the upcoming Saturday and Sunday. Sorry, Fuyuki. Anyway, I don't have any homework today. So, I'll help you a bit for today."

"It's useless! It's now 8 p.m. already!" shouted Fuyuki.

"Calm down," said Natsumi. "Let us finish our dinner and you can sleep earlier. You've worked very hard so far. Thank you."

During the dinner, they talked again...

"Hey, Nee-chan," called Fuyuki. "Have you seen Gunso and the others? They haven't been at home for days... I worry about them."

"I saw them with Momoka-chan beside them," informed Natsumi. "I wonder what they are up to this time..."

Fuyuki thought that Momoka hired those frogs to help her preparing the upcoming meeting. He couldn't sleep that night. He worried Momoka would force them to work overnight. However, Fuyuki fell asleep one hour after he got onto his bed.

"Fuyuki-dono..." called Keroro, trying to wake him up. "Gunso... WAIT! What time is it?!" exclaimed Fuyuki. Keroro laughed as he rolled on the floor. "It's 8:30 a.m. on Saturday, Fuyuki-dono! Who told you to come to school today?" At the time, Fuyuki didn't have any supplementary class, so he could enjoy his day off.

He asked the sergeant where he and his subordinates had gone. Keroro gave Fuyuki a brief explanation. He only said that they worked for Momoka to obtain an astronomical amount of money. "We only worked for twelve hours yesterday, from 12 p.m. to 12 a.m. Usually, we work from 8 a.m. to 12 a.m. Today, we'll work for six hours, starting at 10:00. Of course, we get delicious breakfast, lunch, dinner and some long breaks each day." Keroro also mentioned that Momoka allowed them to sleep overnight inside her majestic mansion sometimes. After hearing his story, Fuyuki relieved, knowing she still treated them quite humane.

On Sunday, Fuyuki woke up at 7 a.m. He only saw Keroro and Tamama eating a loaf of bread and watching television at the same time. "Good morning!" greeted Fuyuki. "Morning, Fuyuki-dono!" greeted Keroro back, followed by Tamama.

For Fuyuki, there was something unusual. He didn't know why his sister wasn't at home, while the frog-aliens were loitering inside his house. "I don't know if Na-chi has another rehearsal today. She's really a hardworking person," said Tamama. "We have finished our work. The rest are just the final simulation and of course, the real deal," told Keroro.

In the afternoon, Natsumi arrived home as Fuyuki and Keroro were making a plastic model together. After greeted her a warm welcome, Fuyuki asked her why she came home earlier that day. "Yeah, you see... it finished earlier today," she answered briefly.

"Say, Nee-chan, what makes you have to attend some intensive rehearsals like those?" wondered Fuyuki. "We're gonna welcome a very important person in a few days and all must be well-prepared. 'More Peach Summer Snow' are gonna sing a song composed by Saburo-senpai," she explained. Fuyuki really wondered who was the VIP she was going to welcome, and where exactly she would welcome that person.