There wasn't a name here he didn't recognize.
Akame, from *Akame ga Kill*.
Frieren, from *Frieren: Beyond Journey's End*.
Saeko Busujima, from *Highschool of the Dead*.
Stella Vermillion, from *Chivalry of a Failed Knight*.
And lastly, Sakurajima Mai.
Isn't she the bunny girl he saw at the library?
[Note: No one could see or touch her, not even the male protagonist. Only Rei Ao could see her, and her childhood storyline will be altered!]
"Are people from my world joining the chat group too?"
[Ding! Your chat group is the 'Dimensional Transaction Chat Group,' and based on your preferences, the members have been locked to '2D female characters.']
"Hiss"
Rei Ao felt embarrassed.
Doesn't this reveal my taste and ambitions?
"Stop it, say no more!"
"I'll just check the chat group's functions."
[Ding! The chat group currently has the functions of 'Chatroom,' 'Livestream,' and 'Transaction System,' with other features awaiting your exploration!]
The Chatroom and Livestream were self-explanatory.
But the Transaction System was the most important.
Transaction System: All chat group members can submit transaction requests to the group leader, Rei Ao.
[Ding! Upon receiving a transaction request, the group leader has the right to select 'abilities,' 'possessions,' or 'energy matter' from the member.]
[Ding! Based on your preferences, a new transaction option has been specially added: 'Body Usage Rights'!]
"Bo Body Usage Rights?"
Rei Ao's eyes widened.
Am I that much of a pervert?
Wait maybe I'm not that old.
"Ahem, all right, all right, I get it."
Having his preferences exposed left him with nothing more to say, but there was no one around to hear it anyway.
Composing himself, he decided to make an announcement in the chat group.
Rei Ao: "Welcome, everyone, to the Dimensional Transaction Chat Group."
Rei Ao: "You already have all the knowledge you need."
Rei Ao: "Now, let the transactions begin."
Chapter 3: Saeko Busujima
[Ding! Frieren has submitted a trade request: A method to eliminate all demons!]
[Ding! Sakurajima Mai has submitted a trade request: A way for others to see me again!]
Right after he finished speaking, two requests appeared.
The first was Frieren's.
Rei Ao checked her information.
[Name]: Frieren
[Level]: 30
[Abilities]: "Elven Bloodline," "Killer Magic," "Defense Magic"
[Possessions]: "Staff"
The available trade options were:
"Elven Bloodline," "Energy Matter," "Staff," "Body Usage Rights," and dozens of different named spells.
If he chose one, Frieren would receive a notification.
As for whether or not she'd accept the trade terms, that was up to her judgment.
But the problem now was
"I have no idea how to eliminate all demons!" Rei Ao smiled bitterly.
Even defeating the Demon King wouldn't wipe out the demons.
Besides, he was only Level 15.
Frieren, at Level 30, was obviously much stronger than him.
If she couldn't solve the problem herself, there was no way asking him would help.
And Sakurajima Mai
[Name]: Sakurajima Mai
[Level]: 0
[Ability]: "Adolescence Syndrome: Cognitive Disappearance"
As expected, the trade options were still abilities, energy matter, and her body.
The only surprise was that her Adolescence Syndrome had become an ability.
Unfortunately, trading abilities and possessions wouldn't affect her condition.
He couldn't resolve her issue through a trade.
In the end, Adolescence Syndrome was essentially caused by the complex emotions of adolescence. Solving it in one go would be very difficult.
Rei Ao: "@Frieren, @Sakurajima Mai, I can't solve your trade requests right now."
He wasn't capable of being a miracle worker, so he opted for honesty.
Rei Ao: "I've only just become the group leader. Do you have any easier trades to help me practice?"
Frieren: "Oh, I guess I'll have to handle it myself."
Sakurajima Mai: ""
Akame: "Can you destroy the Empire?"
Rei Ao: ""
Rei Ao felt like swearing.
Honestly, he didn't even know how strong he was yet.
How could he claim to take on the Empire, which had Esdeath, General Budo, and the Supreme Imperial Arms?
He couldn't guarantee anything.
Stella: "Wow, so there's nothing you can actually do?"
Saeko Busujima: *[Image]*
At that moment, Saeko Busujima, who had remained silent, suddenly posted a picture.
It was of a shriveled, terrifying, corpse-like figure.
Sakurajima Mai: "Is this makeup for a movie?"
She clicked on the image late at night and was startled.
Saeko Busujima: "No, this is a person."
Saeko Busujima: "To be precise, a person who has been infected by a virus and turned into a living dead creature."
Stella: "A human turned into that?!"
Sakurajima Mai: "Isn't that just a zombie?"
Rei Ao: "Or you could call it an undead."
Saeko Busujima: "You know about them?"
Saeko Busujima: "Can you defeat creatures like this?"
Rei Ao: "Submit a trade request."
If it was an undead, a creature that even ordinary people with weapons could kill, Rei Ao felt a bit more confident.
And it seemed like a good opportunity as well.
Maybe he could test his strength in that world.
[Ding! Saeko Busujima has submitted a trade request!]
[Trade details]: Defeat the undead in front of her and help her escape the encirclement.
[Ding! Please choose trade terms!]
"Saeko's swordsmanship and her body?"
Rei Ao stroked his chin thoughtfully.
He chose Saeko's swordsmanship.
He wasn't sure how urgent her situation was.
If he chose her body directly, Saeko Busujima might not agree to the trade.
At Fujimi Academy.
It was supposed to be a calm morning like any other.
But a sudden scream swept through the school.
A type of monster, once human, had appeared, acting like a zombie.
They bit anyone they encountered, consuming human flesh.
Those bitten but not fully devoured wouldn't die.
Instead, their corpses would rise again, becoming new monsters.
These were the undead creatures that Rei Ao, the chat group leader, had referred to.
"Shhh!!!"
Wearing her Fujimi Academy uniform, Saeko Busujima wielded a wooden sword, skillfully smashing the skull of an undead with strength and technique.
Though she was the heiress of the famous Busujima family, renowned for its swordsmanship, and a highly skilled swordswoman herself, facing an endless wave of undead attackers was still exhausting.
Dodging and attacking was draining her stamina quickly.
"Huff huff"
Saeko Busujima panted heavily, her large chest heaving with each breath.
[Ding! Your trade request has been accepted!]
[Trade terms]: Busujima-style swordsmanship
Saeko's eyes narrowed.
Busujima-style swordsmanship was her foundation.
If it was traded away and she couldn't use it anymore, that would be reckless, especially when there was still hope in her current situation.
[Ding! Abilities and possessions are one-time trade options. The trade target will "analyze the essence" to "replicate" them, and it will not affect the original owner's normal usage.]
This notification allowed her to breathe a sigh of relief.
The situation wasn't as bad as she had imagined.
[Ding! Do you confirm the trade?]
[Note: Once the trade is completed, the group leader, Rei Ao, will be obliged to fulfill the trade terms and has the authority to enforce the trade agreement.]
Understanding the situation, Saeko Busujima hesitated no longer.
She made her choice.
"Confirm."
At the same time, Rei Ao received the notification.
[Ding! Trade initiated!]
[Trade target]: Saeko Busujima
[Trade details]: Defeat the undead in front of her and help her escape the encirclement.
[Trade terms]: Busujima-style swordsmanship
[Duration]: 3 hours
[Ding! World crossover will begin in 3 seconds!]
"A world crossover"
Rei Ao sighed slightly.
This chat group could even do something like that.
Counting down in his mind, three seconds passed.
His figure disappeared from the room.
Chapter 4: Apocalypse! Killing and Leveling Up!
""
Just as she was about to strike at the incoming undead, Saeko Busujima suddenly shivered.
She felt an intense cold behind her.
Turning around, she saw a young man with short black hair and crystal-blue eyes staring directly at her.
The key detail: ice crystals were spreading outward from beneath his feet.
"If I eliminate these dozen or so undead, the trade will be complete, right?"
These words came from his mouth.
Saeko Busujima instantly realized that this man was Rei Ao, the group leader with whom she had made the trade.
[Ding! Would you like to start a livestream?]
At the same time, Saeko received a prompt.
Having already seen Rei Ao freeze a monster, Saeko Busujima calmly chose to start the livestream.
[Ding! Saeko Busujima has started a livestream!]
Looking at the undead creatures that had driven Saeko Busujima into this situation, Rei Ao's eyes sparkled with excitement.
[Name]: Undead
[Level]: Level 1
[Ability]: "Undead Virus"
Against such creatures, there was no need to hold back his strength.
"Let's see how strong I really am."
He stomped his foot.
*Crack! Crack! Crack!*
Ice crystals suddenly grew from beneath his feet, expanding outward like thorns.
"!!!"
Saeko Busujima felt a cold wind sweep past her.
In an instant, the dozen or so undead around her were pierced through by nearly one-meter-long ice crystals.
From above, it looked as if a giant, three-dimensional ice flower had bloomed on the ground.
"Is this a superpower?"
Witnessing such power firsthand, Saeko Busujima couldn't hide her shock.
She even questioned whether this level of strength was truly possible for a human.
Frieren: "If you think of this as ice magic, it seems quite intricate."
Frieren: "Is this power released as easily as he wishes?"
Akame: "It feels similar to the power of Imperial Arms."
Stella: "Hmm, not bad, but it's nothing compared to my flames."
Those watching the livestream had various opinions.
However, Rei Ao paid no attention to them.
He was more curious about the abilities he had just gained.
As soon as all the undead were killed, the simple trade was completed.
[Ding! Trade completed!]
[Ding! You have acquired the ability: "Busujima-style Swordsmanship"!]
Instantly, knowledge of Busujima-style swordsmanship flooded his mind, and his entire body felt perfectly attuned to the techniques.
*Crack!*
Suddenly, a katana formed in his hand, made entirely of blue ice crystals.
Saeko Busujima watched in awe as Rei Ao flawlessly executed familiar Busujima-style sword techniques!
"So this is the trade reward?"
Although the swordsmanship didn't seem to provide much improvement for him, it helped him understand how trade conditions worked.
[Ding! As this is your first completed trade, you've earned an additional ability package!]
"Oh?"
Rei Ao's eyes lit up.
"Let's open it and see."
[Ding! You've acquired the ability: "Blessing"!]
Blessing: Grants a blessing, enhancing the recipient in a specific way depending on their nature.
"It seems like this ability is beneficial to others."
Rei Ao chose not to use it on Saeko Busujima.
After all, she wasn't particularly important to him.
He wasn't exactly a saint.
"I'll wait for another chance to test it."
Suddenly, he noticed faint glowing particles on the bodies of the dead.
With a thought, the particles flowed into his body.
"Hm?"
There was no discomfort, but he felt as if he had become slightly stronger.
A curious thought crossed his mind.
"Is this like leveling up by killing monsters?"
"Um Group leader Rei Ao, thank you for your help."
At that moment, Saeko Busujima approached to express her gratitude.
For the first time, Rei Ao focused on the beautiful woman with long, flowing purple hair standing before him.
Sweat dripped from her delicate face, giving her an air of strength and elegance.
But what stood out the most was her striking figure.
Her school uniform seemed barely able to contain the impressive "bunny" that looked ready to burst free at any moment.
"No wonder it's called *Highschool of the Dead*," he thought to himself.
Saeko Busujima noticed Rei Ao's gaze lingering on her chest for a few seconds, but he quickly looked away.
"The trade is complete."
"However, I still have three hours left in this world."
"During that time, you can follow me, but I won't be protecting you."
He intended to kill more undead and further test his powers.
Saeko Busujima thought for a moment, then nodded.
"All right."
She decided to follow Rei Ao.
"Please wait a moment."
She turned and entered a room, returning a short while later with a sharp, unsheathed katana.
She had come here specifically to retrieve this weapon.
"Hehe, well, keep up."
Rei Ao showed no signs of mercy toward Saeko Busujima.
He completely ignored her presence behind him.
Even when undead creatures charged at her, she dealt with them herself, using her katana to cut them down.
Meanwhile, Rei Ao fully unleashed his powers.
Any undead within a few dozen meters of him were instantly frozen into ice sculptures.
He also tested his strength to its limits.
How to describe it
At full power, he could freeze an entire building or punch it down into rubble.
The commotion he caused was massive, leaving Saeko Busujima almost dumbfounded as she narrowly avoided getting caught up in it.
He had now reached Level 16.
It was clear to him now that killing these undead allowed him to level up.
So he became even more enthusiastic about it!
He no longer cared about the noise he was causing.
This part of the campus had become like a completely different world from the rest.
Everywhere Rei Ao went was covered in frigid ice.
The environment had been utterly transformed, resembling a world made of towering ice crystals.
"Hmm, looks like I've cleared all the undead in this area. Time to find another spot."
Chapter 5: Is this alright?
Frieren: "Strange, why doesn't his power have a limit?"
Frieren's normally calm eyes now showed a trace of curiosity.
She didn't believe that anyone could have unlimited power.
Even her own vast magic reserves, though immense, would eventually be exhausted if used at full force.
