In this crossover anime, I fight against the supernatural in my everyday world.

Rio Futaba, who is she?

In the original storyline, she was able to combine Mai Sakurajima's puberty syndrome with the theory of quantum mechanics and provide a concrete solution.

Rio Futaba's analysis was never wrong.

What does this mean?

If this were set in a fantasy or martial arts world, Rio Futaba would be a powerful figure who could make her words law!

It's terrifying, absolutely terrifying.

The kimono-clad female ghost paused for a moment before coming to her senses. She gave Futaba Rio a deep look, covered her lips, and smiled meaningfully.

"Little sister, although you are just an ordinary human, you are quite intelligent. Just as you said, this is my purpose."

Ye Xing thought to herself, "My sister is my sister, but..."

He glanced at a certain part of the kimono-clad female ghost.

The other party doesn't seem to have the right to call Rio Futaba "little" sister.

"So, are you in or out of this deal?"

"no problem."

Ye Xing didn't hesitate for long and gave his answer directly.

"Then let's sign the contract."

Upon hearing the word "contract," Hachiko, who was standing next to him, couldn't help but tremble, as if recalling some memories he didn't want to remember.

"Of course, a contract must be signed."

The kimono-clad female ghost extended her right hand, and an evil spirit immediately ran over and respectfully handed her a scroll.

Don't say it, you really don't say it.

This scene has a certain air of sophistication, like a mafia boss extending his hand and his underlings knowingly going to light a cigarette.

"Come."

The kimono-clad female ghost unfurled the scroll, and several lines of small characters slowly appeared on the previously blank surface—the very conditions of the contract she had just proposed.

The word "contract" carries a very strong binding force.

Hachi once told Ye Xing that whoever violates the contract will suffer extremely severe consequences, even death.

This is far superior to contracts that appear harmonious on the surface but engage in underhanded tactics behind the scenes; there's absolutely no loophole to exploit.

The kimono-clad female ghost took the brush and, with an extremely elegant movement, wrote her name on the scroll.

Rio Futaba, who was standing right next to him, widened her eyes in surprise when she saw the name written on the paper.

She was a science-oriented girl who loved studying quantum mechanics and knew very little about supernatural tales.

The name on the scroll is familiar to many people, not only in Sakura Province but also throughout Kyushu.

Unexpectedly, the true identity of this kimono-clad female ghost was that of such a powerful demon.

"now you."

"it is good."

Ye Xing took the brush from the kimono-clad female ghost, bent down, and wrote his name on the scroll.

He also considered whether to use the power of evil spirits to condense a dagger, cut open his finger, and sign a blood oath.

But after thinking about it carefully...

That seems a little painful, there's no need for that.

Forget it, I'll stop pretending today. I'll do it another time.

However, after Ye Xing signed her name, the kimono-clad female ghost frowned slightly, a look of doubt she had never seen before appearing on her face. She muttered to herself while frowning.

"What's going on? The contract... hasn't taken effect?"

The kimono-clad female ghost is hard to understand.

Even though both parties signed their names, the contract did not take effect.

There is only one explanation for this situation.

That is, one of the parties to the contract lacks the ability to fulfill the terms of the contract.

She knew that she was absolutely capable of keeping her promise.

Logically, at this point, one should start to suspect the other party.

The kimono-clad female ghost clearly witnessed Yosei using the ability to devour evil spirits right in front of her.

To prove this point, she even went so far as to sacrifice dozens of her own followers.

Then why is that?

"Didn't it take effect...?"

Ye Xing didn't seem surprised; he just smiled and said...

"In that case, sign my other name."

"Ok?"

Rio Futaba, Yui Yuigahama, and Miko Yotsuya were all somewhat bewildered upon hearing this.

You have another name?

How come we didn't know about this?

Could it be that you were a wanted criminal before?

Ye Xing didn't care about the questioning looks from the members of the Superpower Society; he simply wrote another name with a brush.

His movements were quick, but it felt like there were more strokes, definitely more than just two characters.

Before Rio Futaba could even see it clearly, the kimono-clad ghost's expression suddenly changed when she saw the name written by Yohoshi. She quickly put the scroll away and into her bosom.

"The contract is now established, so I shall take my leave."

After saying this, the kimono-clad female ghost quickly turned around, got into the carriage, and, along with her entourage, swiftly left the area.

For some reason, as Yuihama and the others watched the figures of these evil spirits gradually disappear into the distance, they all had the same thought in their minds.

they...

It seems like fear?

The kimono-clad female ghost, who had been maintaining a serene and elegant demeanor, appeared extremely panicked after seeing the name written by Ye Xing.

What exactly was written down?

......

Ten minutes later, in the real world of Kyoto, inside an abandoned hospital.

"Finally home."

After passing through the "door", Ye Xing took out his phone and glanced at it. It was only 6:30.

"How did we end up back here?"

Rio Futaba and the others were speechless.

So you went in with such a big fuss, but only stayed for an hour and a half?

For nearly an hour, I was still walking with that group of evil spirits and monsters, listening to the Hundred Birds Paying Homage to the Phoenix played by the Night Star all the way.

Is this the other world, a concert venue?

Who's the kind person who holds a concert with a suona (a traditional Chinese wind instrument)?

"I can't take it anymore, there's no other way."

Ye Xing looked extremely tired and leaned against the wall.

"My power is too depleted. Staying in the inner world any longer would be dangerous."

Upon hearing this, Rio Futaba frowned slightly, pursed her lips, hesitated for a moment, and then knelt down next to Yohoshi.

Although she tried to keep her tone calm, the concern and worry in her voice were still undeniable.

Are you alright? Should we go to the hospital?

What puzzled Rio Futaba was that when she said those words, Miko Yotsuya and Yui Yuigahama, who were standing next to her, had somewhat complicated expressions.

"thanks for your concern."

Ye Xing sighed and slowly began to speak.

"I actually used up nearly 10% of my power and was about to fall below the 90 HP safety line. What a close call!"

Rio Futaba was stunned.

Ten percent?

Wait a moment.

100% minus 10% equals what?

Ninety percent!?

"you!"

Rio Futaba then realized what was happening.

Seeing Ye Xing's exhausted appearance, she assumed that the other party was too weak to continue fighting the evil spirits, so they found a "door" nearby and rushed back to the real world before the demon horn was over.

The result? There's still 90% of the power left!?

"See, you think it's pretty dangerous too, right? It was practically a life-or-death situation."

Hearing Yohoshi's matter-of-fact words and seeing Rio Futaba's bewildered expression, not knowing how to respond, Miko Yotsuya and Yui Yuigahama both covered their mouths and chuckled.

Think back to the beginning.

They had both suffered the same loss before.

Seeing that even the usually rational and composed Futaba has fallen for it, I really can't hold back anymore.