Serenia walked alone in Kimetsu Public Park as her eyes continued to stare at the picture of Demaclos. The elderly man she almost bumped yesterday is actually a rogue Erionian professor, and she never thought about it. The picture was given to her by Tiresias.

Serenia couldn't believe it. Just like Mordrezan, Demaclos is an evil scientist who had involved himself in illegal experiments. Yet he kidnaps his victims from...another timeline? For what?

Since Demaclos was present in the park yesterday, Serenia was certain that he will come again to the park today. She just need to keep a track on him.

"Hey you!"

Serenia just heard a familiar male voice called her. When she turned behind, it was Inosuke who approached her. And he was pointing his index finger towards her.

"Oh, you again" Serenia said.

"Hey, what are you holding?" Inosuke quickly snatched the picture from Serenia's hand.

"Ah!" Serenia was shocked by Inosuke's sudden actions.

"Who's this? Is this your human friend?" Inosuke asked in curiousity as he looked at the picture.

"No...but I was searching for him" Serenia answered.

"Searching for him?" Inosuke was still curious.

"Oh...it's a long story either" Serenia scratched her head.

"There you are, Inosuke!"

Soon, Tanjirou and friends walked towards the boar boy and the alien girl.

"Inosuke, where did you got that picture?" Zenitsu asked as he spotted the picture on Inosuke's hand.

"This alien girl is looking for her human friend!" Inosuke said.

"Human friend?" Nezuko raised her eyebrows.

"No, no, no, he's not my friend, just..." Serenia tried to explain. "It's a very long story anyway"

Sabito just yawned.

"And one more thing, before I forgot" Serenia said.

"What's it?" Tanjirou asked.

Serenia turned her face towards Inosuke.

"Can you give back the gemstone you found?" Serenia asked for the voidstone from Inosuke. "I was searching for that gemstone for days, and it's too dangerous for a normal person like you to have it"

"What?" Inosuke was startled.

"That gemstone...how do you know it was in Inosuke's possession?" Aoi asked in shock.

"Unless if you possess a telepathic ability, you won't know if your boyfriend has stealing your food" Serenia said.

...

Serenia have expected that Demaclos will appeared again in the park today, but her expectation was wrong.

For today, Demaclos was taking a walk in a street. He was looking silently at his surroundings, there are a lot of shops in the each sides of the street. And a good thing for him, a certain shop just gained the attention of the rogue professor.

Kamado Bakery.

As a lover of breads and pastries, he even could smell the sweet scent of freshly baked breads from outside. Not wasting time anymore, he entered the bakery.

Meanwhile inside the bakery, Giyuu and Kyoujurou and Tamayo sat together on the table. A lot of cheese breadsticks were seen on the plate on the table, aside of three cups of coffee.

Yummy! Yummy!" Kyoujurou happily ate the breadsticks.

"You're loud as always, Rengoku-san" Giyuu commented.

"It's so delicious! Both of you must try it!" Kyoujurou exclaimed.

"I think I want to take some buns to eat" Tamayo said as she rose up from her seat.

As Tamayo walked towards one of the shelves...

"Tamayo-sensei?"

The school doctor heard a younger male voice calling her. When she turned her face towards the person, it was Yushiro.

"Good evening, Yushiro" Tamayo greeted the boy with a smile.

"Good evening" Yushiro greeted back with a blush.

"What's the matter?" Tamayo asked.

Giyuu's eyes narrowed when he saw Yushiro trying to flirt with Tamayo. He also rose up from her seat before walked towards them.

"My parents are going outstation today, so...can I stay with you for a night, Tamayo-sensei? I can help you preparing the dinner"

"You can stay with me instead of Tamayo-sensei"

Out of sudden, Giyuu wrapped his arm around Yushiro's neck.

"To-tomioka-sensei!?" Yushiro was startled.

"Why did you always go to Tamayo-sensei's house? Everyone will suspecting you as a pervert, you know" Giyuu said.

"But I'm not a pervert!" Yushiro denied. "Tomioka-sensei, let me go!"

"No" Giyuu refused.

"Tamayo-sensei, please help me!" Yushiro pleaded.

Tamayo just giggled at their behaviour.

At the same time, Demaclos was thinking whether he should pick up a grilled cheese sandwich or a butter and milk bun. His hand was holding a black tray.

"Can you pick those tarts, nii-san?"

Demaclos turned his face to the left. He saw Gyutaro and Ume were picking some pastries nearby.

"This one?" Gyutaro asked.

"Yeah, this one" Ume nodded.

Demaclos just stared silently at them, and he didn't realize an another man wearing a black business suit bumped on him. And the strange thing about this man is he "wore" a real bird nest on his head with a yellow finch resting inside.

"Uh!" Demaclos almost collapsed on the floor, dropped the tray from his hand.

"Oh, sorry!" the man apologized as he helped Demaclos.

"It's okay" Demaclos said.

"Sorry about that, I need to hurry since i've an urgent business after this" the man said.

Demaclos gave him a weird stare.

"What's wrong?" the man raised his eyebrows.

"You..."

"Ah, you mean this?" the man pointed his index finger towards the bird nest on his head. "It's a long story"

"Okay, I got it" Demaclos said.

Unbeknownst to Demaclos, that man is a Black Narcissus agent. He's most likely sent by Kazuhiko to investigate the presence of aliens in Kimetsu Town.

...

"What!? You said there are humans who live in another planets!?"

Tanjirou and friends were shocked when Serenia told them about the existence of human civilizations outside of Solar System. It may sounds weird to them, but Serenia doesn't have the time to tell a lie.

"Maybe all of you thought that Earth is the only planet inhabited by humans, but there are also planets outside there who are dwelled by humans too" Serenia tried to convince.

"Wow" Muichirou was intrigued.

"Are they originally came from the Earth too?" Rui asked.

"I'm not sure about that, but for the Erionians, yes" Serenia answered.

"Erionians?" Tanjirou and Kanao exchanged looks.

"As far as I know, Erionians are the humans who are descended from the original inhabitants of three lost continents of Earth" Serenia explained.

"Can you tell us the names of three lost continents?" Kanao asked.

"Give me a few seconds" Serenia said.

Tanjirou and friends were waiting for Serenia to speak.

"Atlantis..." Serenia started counting using her fingers.

Wait a minute, you said Atlantis!?" Tanjirou was disbelieved.

"But I thought Atlantis is a lost city, right?" Aoi asked Tanjirou in confirmation.

"Yes" Tanjirou nodded.

"Does Atlantis is really exists?" Muichirou wondered himself.

"The other two! Say it!" Sabito demanded.

"Lemuria..."

"Lemuria?" Makomo was curious.

"A hypothetical continent situated in Indian Ocean" Rui explained briefly.

"Mu..."

"Mu The Bull is a continent disguised as a cow?" Inosuke was dumbfounded.

"Inosuke, Serenia isn't mentioning about the cartoon that aired in the weekend morning" Aoi rolled her eyes at her boyfriend in frustration.

"Then?"

"I think Mu is also a mythical continent like Lemuria, but it's location is in Pacific Ocean" Tanjirou was the next to explain.

"Correct" Rui nodded.

"I never thought these continents are actually exists at all" Tanjirou said.

"How did they leave Earth? Did they built their own spaceships?" Rui asked.

"According to their old legend, their ancestors have invoked their sea gods when the three continents were about to sunk, and their sea gods has answered their prayers by creating a portal for them to migrate safely to Erion" Serenia replied.

"Poseidon!" Inosuke exclaimed.

"What?" Everyone then looked at Inosuke.

"Yes, Poseidon is one of the sea gods of the Erionians"

"Looks like they're still worshipping the Greek gods to this day" Yuichirou said.

"And one more thing I want to tell you" Serenia then turned behind before walked a few steps away from them.

"What's it?" Tanjirou said.

"If you want to know, my ancestors are also...humans like you"

"What!?" Tanjirou and friends were shocked. Did Serenia was speaking the truth...or she just merely lying to them?

To be continued...

Fun Fact #4: Most, if not all of aliens who have antennas are born with telepathic abilities