[Third Person's Perspective]

"It's done~."

Luzeria-san with a smile.

She was holding a steaming hot pot with her bare hands.

Inside, there was meat simmering away.

"Wow."

"Whoa."

The meat was from the bear monster they had just faced.

Its name was "Forebear."

It was famous as a high-quality meat even in another world.

[Where did the bear go!?]

[It's already in the pot]

[Instant kill → cooking.]

[I missed it because I was in the bathroom.]

[Older Sister: "How should I cook it?".]

[I didn't really think she would actually cook it lol.]

[She has heat resistance so she can handle it barehanded lol.]

[Looks delicious.]

[It's high-quality meat after all.]

"This isn't so bad?"

"Yeah."

The three of them took a meal break around the fire.

Luzeria's cooking skills were top-notch.

For some reason, she also brought seasonings and thoroughly enjoyed the hot pot.

Then, Kokone clung to Kanata's arm and started to doze off.

"Master..."

"Haha, are you full?"

[Is today the camping stream?]

[They're too relaxed lol.]

[This is technically the lower level, right...?]

[There's no tension haha.]

[Come on, stay alert.]

[I get to see Kokone-chan's sleeping face, ＾＾]

[So cute (hehe).]

Even though they were taking it easy, they still had their defense network setup.

They were surrounding a wide area with Luzeria's flames.

With that sense of security, Kanata continued.

"Since it's a good time, shall we have a little chat?"

[Just right (lower tier).]

[Actually, Kanata-kun lacks common sense too, huh? lol.]

[He's overshadowed, but he's pretty much the same, right? lol.]

[A normal person pretending to be abnormal.]

[Considering the people around him...]

"It feels like I'm being told something terrible... Oh, I'll read the question now."

[In the end, what exactly is a familiar?]

In another world, there were three races.

Humans, demons, and demi-humans.

The demons corresponded to modern monsters and were in conflict with humans.

The demi-humans, on the other hand, were basically neutral.

Kokone and Luzeria belonged to the demi-humans.

Among them, familiars were─.

"I suppose a familiar is a demi-human contracted with me."

[Wow, that's amazing!]

[So there are beings called Ajin?]

[I still have so much to learn about dungeons.]

[Wait, a contract!?]

[You can actually give orders!?]

[Huh?!]

[Does that mean...]

In response to a comment that imagined something in the latter half, Luzeria teased.

"That's right. Kanata-kun is always giving me lewd orders."

"I've never done it before, have I!?"

[This guy!]

[Kanata, you bastard!]

[What an outrageous guy!]

Comments poured in half-jokingly about their enviable relationship.

Additionally, Luzeria broke into a slight smile.

"A 'contract mark' appears on demi-humans who have made a contract. See?"

Luzeria undoes one button of her clothes.

On the upper part of her chest, a crest emerges.

It's the contract crest indicating her pact with Kanata.

The stimulating image causes the comment section to erupt in joy.

[Whoa.]

[Older sister!?]

[W-What an outrageous place for the contract mark!]

[Oh my gosh.]

[I'm honestly grateful.]

[E-eh.]

[That's too lewd!]

[Big.]

[OMG.]

[↑ Even foreigners are saying 'Oh my gosh'.]

But Kanata was flustered as he fastened her button.

"Y-you don't have to show that!"

"Aww, but I want everyone to see it too. It's proof of my bond with Kanata-kun♡"

"Please, take care of yourself. And my channel will get banned!"

Then, Kokone next to him suddenly sits up.

Her eyes were burning with a competitive spirit.

"Look, there's also Kokone."

"Hey!?"

Kokone placed her hand on the zipper on her back.

As she slowly pulled it down, the same mark appeared.

It seemed that the location of the contract mark was random.

"It's a mark that shows Kokone and her master are connected."

"Do you guys want me to get banned!? Raise it, raise it!"

[Does it change depending on the familiar?]

[What the heck, no, it's a good system!]

[Kokone-chan has a mark on her back...]

[Phew...]

[Thank you for showing off the contract mark.]

[Thank you for the wonderful stream.]

[Can you lower it a bit more?]

[It's cute how you have a competitive spirit.]

[If I may analyze it as a senior explorer, it's a wonderful back.]

It seems that once it comes to this, some concerns start to arise.

[Does the contract mean there are restrictions as well?]

"Ah, it's there, but..."

A contract is something that binds a familiar to its master until the goal is achieved.

Kanata's contract was for the “Demon King Subjugation.”

Since the goal has been achieved, the contract can be terminated.

However, the two familiars... won't allow it.

"Shall we go ahead and erase the two of your contract marks soon─"

"No." "No."

"...I thought so."

The contract mark binds the familiar.

However, the two were still proud of it.

They were prepared to give their all for Kanata.

"Master, if you say it one more time, I'll cry."

"Kanata-kun will be with his big sister forever, right?"

"I get it, I get it! It's just confirmation!"

Kanata hurriedly corrected himself as the two approached him with hollow eyes.

""Hehehe.""

[Love is heavy lol.]

[Are they tying themselves up lol.]

[Rather, Kanata-kun is the one being restrained lol.]

[Master-servant reversal.]

[Scary.]

[Yandere lol.]

[Scary but enviable... scary but.]

[Their eyes are serious.]

[Heavy is good.]

"So today, it's a 'night contract' with older sister."

"I told you I'm not doing it!"

"Yay."

By the way, Kanata can also issue immoral commands.

This is because he is bound by the most severe "Blood Oath Contract."

Still, he has never done it even once.

Like any adolescent, he is curious.

However, there is something that keeps crossing his mind.

(After all, there were scumbags who treated demi-humans terribly...)

In the other world, there were people who abused contracts.

They would use their position and force demi-humans into contracts.

The outcome was that men became laborers and women became comforters.

Kanata had seen such scenes but had not intervened.

"Geez, Kanata-kun, you're so stingy."

"Yeah, yeah, keep saying that."

Luzeria understood that too and said it half-jokingly.

However, if ordered, she would gladly accept it.

She adored Kanata that much.

(I was saved to the extent that I could think that way.)

Suddenly, a memory of meeting Kanata crossed her mind.

★─★─★

In another world, one day.

"Ugh, ugh..."

The red-haired girl was lying in a dark forest.

She was once Luzeria.

Her face was still young, and her body was small.

"I'm so hungry..."

She hadn't eaten anything for a week.

Her body was already weakened.

However, Luzeria finally made up her mind.

(But, this won't cause any trouble, right...)

A week ago, Luzeria hid herself in the forest.

The reason was that she couldn't control her excessively strong fire and might hurt those around her.

At that time, Luzeria couldn't control her overpowering flames.

Her mother was burned alive while giving birth to her.

Her father fled in fear of her power.

Not a single villager approached her.

Too kind, Luzeria left the village, thinking it would be better if she just died.

So as not to trouble those around her.

However, she didn't have no regrets.

"What was I born for..."

She had been feared and persecuted since birth.

She couldn't find any meaning in her life.

And above all, she was simply afraid of dying.

─At that moment, a boy appeared.

"Are you okay?"

"─Huh?"

"You're hungry, right? Here, take this."

"...!"

The one who offered the bread was an unfamiliar boy.

It might be suspicious, but she couldn't resist her hunger in such extreme conditions.

The young Luzeria devoured the bread.

"It's so, so good...!"

"Really? I'm glad~"

The boy reached out his hand to Luzeria.

However, she realized after taking his hand.

If the boy's hands weren't resistant.

"Ouch, ouch, ouch!"

"Ah, ah...! I'm sorry!"

However, this was on purpose.

It seemed the boy wanted to experience fire firsthand.

Blowing on his hands, the boy laughed.

"Haha, your power is as amazing as the rumors say!"

"Huh?"

"I've been looking for you. This power can be put to good use!"

"...!"

The boy had heard rumors about Luzeria in a nearby village.

Hearing that, he came all the way to find her.

"I'm Kuon Kanata. Will you come with me?"

"~~~~!"

For the first time, she was told she had "amazing power."

For the first time, she felt glad to have been born with the power she had always hated, resented, and cursed.

It was truly the moment when Luzeria found hope.

"Yes!"

And then, taking Kanata's hand, she felt the warmth of human skin.

From then on, Luzeria underwent rigorous training.

To control the power, not into a hot flame, but into a warm flame.

Of course, it's all for Kanata.

So that one day, she could touch him from the heart.

So that one day, she can hug him tightly.

And so that she can become the "older sister" who can eliminate all threats to Kanata.

That strong desire greatly helped Luzeria grow both physically and mentally, and bloom her talents.

"Kanata-kun, from today on, I'm your big sister!"

"The growth rate of demi-humans is amazing!?"

Perfectly controlling both hot flames and warm flames, to the point where it's called the “Inviolability Flame” that no one can approach─.

★─★─★

"Hehehe."

Luzeria has never forgotten that encounter for even a single day.

That's why she dedicates her life to following Kanata.

Whether it's to defeat the Demon King or to return to the present.

"W-What is it? Do I have something on my face?"

"Nope. Nothing at all."

"Oh... well, that's just like you."

Then, Kanata stood up.

He seemed to have had enough to eat and rest.

"So, where to next.. hmm!?"

At that moment, a breaking news alert appeared in the comments section.

"A large number of monsters have appeared in the lower levels of the Sapphire Dungeon. This is presumed to be the result of a Dungeon Shift a few minutes ago."

It was an emergency dungeon alert.

The location was the same floor where Kanata and the others were.

The alert continued.

"Multiple explorers and streamers have been reported injured."

"What!?"

It seems that the flames of Luzeria were so safe that they didn't notice.

The temperature difference with this stream might cause burns, but Kanata immediately took action.

"Let's go too… huh?"

""Whoooaaaa!""

"Hey, wait, you two!?"

But Kokone and Luzeria were already running off.

It seemed they were heading deeper into the lower levels.

While chasing after them, Kanata was moved by their determination.

"I'm impressed! You're going to help right away!"

""Waittttt.""

"Huh?"

However, there was something off.

"Master's skill!"

"Kanata-kun's skill!"

"...!?"

While uttering ominous words, the two of them sped off.

Chapter 9: The Day I Became a Big Sister