"The cold and remote outer planets, Uranus and Neptune are known as the ice giants because their interiors are compositionally different from Jupiter and Saturn..."

The evil politician, Muzan Kibutsuji sipped a cup of cappuccino as he watched a documentary of outer planets of Solar System.

Beep! Beep!

Muzan just received a call from his secretary and right hand man, Kokushibou. He quickly answered the call.

"Good morning, Kibutsuji-sama" Kokushibou greeted his boss. "Sorry for interrupting you but we got a huge problem"

"A huge problem? What's it?" Muzan raised his eyebrows.

"Three of our spies had been murdered by the aliens, and their corpses are found by the Black Narcissus agents in an abandoned building" Kokushibou informed.

"Murdered by the aliens!?" Muzan was shocked in disbelief, he quickly raised from his seat.

"It was hard for me to believe at first, but unfortunately it's true after all" Kokushibou stated. "And more thing, our agents have been on their way to Kimetsu Town"

"Come here immediately! We'll go to Black Narcissus headquarters soon!" Muzan ordered.

"Yes, Kibutsuji-sama!"

Muzan then ended the call as he slowly sat back on his chair. His face was looking grim after Kokushibo told him the unpleasant news.

...

"Hmm...such a nice art" Natsuo smiled as he inspected a koi acryllic painting on the wall in Rengoku family's house. It was painted by Tengen himself as a flashy birthday gift for Kyoujurou last year.

"Alright, I guess it's time for us to go"

Natsuo could heard Denji's voice from nearby as the bird nest agent put his files back into the suitcase. The agents just finished gathering all informations from Senjurou and Mitsuri regarding the events of last night.

"Anyway, I must say thank you for cooperating with us, Rengoku-san" Denji thanked Shinjurou as both of them shaked hands. Denji's pet yellowfinch chirped happily.

"No problem, mister. I suggest it's better for you to buy a bird cage" Shinjurou replied awkwardly.

Meanwhile, as Shinjurou and the agents left the living room, Kyoujurou slowly rose up from the floor as he was heading to the kitchen.

"I want to take some juices from the fridge, you guys stay here first" Kyoujurou said.

Mitsuri however decided to follow Kyoujurou to the kitchen too.

"Mitsuri-chan, where do you want to go?" Senjurou asked.

"Oh, there's something important I forgot to tell your brother" Mitsuri replied.

A few seconds later, when Kyoujurou took several juice bottles from the fridge, he noticed Mitsuri entered the kitchen.

"Rengoku-sensei?" Mitsuri called her former teacher.

"Yes, Kanroji?" Kyoujurou placed the bottles on the table.

"About those aliens... I need to tell you something" Mitsuri said.

"What's it?" Kyoujurou asked.

"What do you think if they can read your mind?" Mitsuri said. "Especially when they read your past memories"

"Past memories?" Kyoujurou's expression began to change. "Why?"

...

"What kind of strange object is this?" Periborix asked in curiousity.

As Mordrezan were busy with his own experiments, the other aliens gathered around a metallic table, with a floral patterned white ceramic pot in the middle. The pot's hole was somehow sealed with yellow paper talismans.

Apparently, another two of Zargoror's henchmen, Berdamor and Orbaum found this pot from an unknown location after they successfully retrieved an artifact from a rival crew.

"I don't know what's the purpose of this object, but I can feel something worthy hidden in it" Berdamor said. He has a short moss green hair, pointed ears, a pair of dark brown antennas and black mechanical spincers instead of hands (he lost his antennas and lower arms in a devastating war).

"And I wish it's an inflammable item!" Orbaum the pyromaniac alien shouted. He has a short pine green hair with mahogany-coloured streaks, pointed ears and a very small single black antenna shaped like a lollipop in the middle of his head. He always carried his signature futuristic flamethrower rifle with him.

"This is what the Erionians and Earthlings call a pot" Bithus answered.

"And they use it as a bomb!" Vozurek guessed blindly.

"No, they never use it as a bomb" Bithus replied. "It's a common item the humans sell in their market"

"Ah, a valuable item, I see. Now let's see what's contained inside this pot" Periborix then took the pot before tear away the paper talismans.

However, something unexpected happened. A male vengeful spirit finally emerged from the vase.

"What the..." Bithus was shocked. "A ghost?"

The spirit then curiously stared at the aliens.

"Wait a minute, am I surrounded by demons?" the spirit was confused. "Have Muzan-sama gave you some orders?

"Who's Muzan? And we're aliens!" Periborix replied.

"Aliens? What's that?" the spirit was clueless about them.

"He never heard about our existence before?" Orbaum looked at Vozurek.

"I don't know, but looks like this dumb spirit trapped too long inside this stupid pot" Vozurek said.

"What!? You called me a dumb spirit!?" the spirit was upset. "Watch your mouth, fool! I'm Gyokko! The former Upper Rank Five demon!"

"Upper Rank Five? Are you some kind of an army officer?" Orbaum asked.

Gyokko then went silent for a few seconds.

"No" Gyokko shooked his excuse.

"Excuse me, have yo-"

Mordrezan soon entered the room when he saw Gyokko surrounded by his comrades.

"Why did you feeble-minded stooges summoned a spirit of the dead inside our spaceship?" Mordrezan asked with narrowed eyes.

"Is that your leader?" Gyokko asked the aliens for confirmation.

...

"What!? Evil aliens are trying to kidnap you!?" Inosuke shouted in disbelief, roughly shaking Senjurou's body.

"Inosuke, stop it!" Aoi scolded.

Inosuke then removed his hands from Senjurou's shoulders. The younger Rengoku's head felt very dizzy.

"Tanjirou, what should we do? The aliens are going to change all us into zombies!" Zenitsu cried as he clinged on his friend. Tanjirou's youngest brother, Rokuta silently stared at the blonde boy as he ate mini chocolate chip cookies.

"Zenitsu, let go of my onii-chan!!" Nezuko tried to pull Zenitsu away from Tanjirou.

"Agatsuma-senpai, I think you're too panic" Muichirou commented.

"What do you know!? This is much more worse than that horror game you forced me to play!" Zenitsu yelled.

"Granny will come to your house tonight" Yuichirou taunted.

"SHUT UP!" Zenitsu yelled again.

"And she will kidnap Chachamaru first" Yuichirou added.

"Hey!" Yushiro felt offended, protectively clutched his pet cat.

"I'm just joking" Yuichirou said.

Yushiro just glared at him.

"Don't ever try to say something bad to Chachamaru...and Tamayo-sensei" Yushiro warned.

"No wonder you're stalking Tamayo-sensei every school day" Sabito stated.

Yushiro started blushing deeply.

"What? No! I didn't do that!" Yushiro denied.

"By the way...does the presence of those evil aliens have something to do with Serenia?" Aoi hypothesised.

Everyone quickly turned their attention towards Aoi. Even Kyoujurou and Mitsuri paused their walk to eavesdropped their conversation.

"Who's Serenia?" Senjurou was dumbfounded.

"Tanjirou, should we tell Senjurou-kun about that alien girl?" Zenitsu whispered to Tanjirou.

"Well..."

Senjurou's eyes focused at Tanjirou.

"Senjurou, I think I must tell you about her" Tanjirou said as he scratched his head.

It wasn't a good situation if Tanjirou lied to Senjurou. Sooner or later, the hanafuda boy need to tell him the truth.

Kyoujurou and Mitsuri wondered, did Tanjirou and friends just hid something from them?

...

"Zargoror has been looking for this planet for a long time" Silmor said.

Somewhere outside of their spaceship in the forest, Silmor was facing a large old tree, and Serenia was standing behind him.

"There's an ancient weapon hidden by the kings of the old era beneath the southernmost continent in Earth" Silmor revealed.

"An ancient weapon?" Serenia raised her eyebrows.

"Yes, my daughter. Due to it's destructive nature, many rulers from countless regions competed to seize it in hope of securing their own realms and bring a permanent end to their enemies, yet no one succeeded in their quest" Silmor explained.

Silmor then took a small stone from the ground.

"And to find this weapon, Zargoror needs a special key" Silmor turned his face towards his daughter.

"A special key? How?" Serenia was curious.

"A special gemstone which can disguise itself as a common stone" Silmor replied. "An oracle tells me this...somewhere in this planet, there's one young man who has found this gemstone, he died as a traitor in his past life, and was reborn again as an impostor"

Silmor finally threw the stone upwards.

Meanwhile, in the living room inside the Inadama residence, Kaigaku swiftly grabbed the stone before it fell on the floor. He found this strange stone when he was going for a vacation with his family in Hawaii last year, and he brought it back with him. It was only him in the house since his parents were going to supermarket.

Beep! Beep!

Kaigaku was a bit shocked when he just received a call from Kokushibou, making him wondered why. He quickly answered the call.

"Morning, Kokushibou-san" Kaigaku greeted the older guy. "What's the matter?"

"Kaigaku-kun, sorry for disturbing you but there's something important I need to tell you" Kokushibou said.

What's it?" Kaigaku asked.

"Muzan-sama has sent two his agents here, and they'll arrive here in anytime" Kokushibou informed.

"Really?" Kaigaku's eyes widened.

To be continued...