"I am concerned," he said.

After waking up and seeing his condition, it seemed like there were more side effects than just passing out.

"Is it possible for emotions to fluctuate severely?" he wondered, considering how tightly she had held his hand when he woke up yesterday and how irritable she suddenly became today.

"Please contact the chief of the investigation team. Detective Urseau has collapsed again," she said.

He was tired. Leila squinted her eyes. His throat was a little sore.

"But this is okay," he thought to himself.

It was okay to be angry for no reason. They could both be angry together.

"As long as you didn't betray the family for personal gain," he said.

If that were true, he wouldn't be disappointed in him, he would despise him.

"So let's hope it's not just that," she said.

She walked towards his room.

* * *

“…….”

Silence hung heavy in his room. Leila sat with her arms crossed, while Arcangelo sat upright, holding his head in his hands.

"I'm sleepy," he muttered.

Although Arcangelo appeared to be lost in thought, Leila, in fact, was not concerned with what he was thinking. She had done everything she could when he had fainted.

So now, she simply felt sleepy.

"There's a visitor."

"Ah."

Just when she thought she might doze off, the person she had been waiting for arrived. Leila uncrossed her arms and rose from her seat. A familiar face appeared before her.

"Good to see you again. You were here yesterday, weren't you?"

It was the dear researcher who had come when Arcangelo had collapsed.

"We won't have anything good to gain from meeting too often. Of course, I'm not talking about the stories of Detective Urseau and Cassilia. I just find them amusing."

The researcher had brought a machine with her and connected it to Arcangelo's body. It showed the waves that were emanating from him.

"Let's see. You said he collapsed 30 minutes ago. But the waves are very stable for that kind of thing."

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"That's true, but his initial reaction was unusual."

Her words made him tremble for a moment. But he said nothing and didn't even look at her.

Leila noticed his response.

"Well, what was unusual about it?"

"It felt like it was harder for him to regulate his emotions than usual. Normally, if you were to refine your emotions and then express them once, it would seem like he was expressing them raw."

"Hmm."

The researcher's eyes glimmered with a spark of excitement.

"It's probably not a big issue."

Despite his amused expression, his tone was calm.

"Since the root of our werewolf nature is animalistic, our instincts tend to emerge in the face of persistent threats to our lives. Just like when we first deciphered the code."

In his words, the two of them remembered what had happened then.

Leila felt annoyance building up inside her, along with a growing heat in her face. She scrunched up her face and turned her head away, and Arcangelo didn't look much different.

"Officer Urseau, there don't seem to be any issues right now, but is there anything wrong or uncomfortable with your body?"

"No, there isn't."

"I thought so, but it's good to confirm. Thankfully."

Somehow, this person seemed rather peculiar. Leila and Arcangelo thought the same thing.

But there were plenty of unique individuals among the researchers. The more skilled they were, the more so.

"Ah, and while we're at it, may I ask you two to hold hands?"

"What?"

"I have a hypothesis I want to test."

Arcangelo's face twisted in disbelief. Leila's expression wasn't much better.

But she reached out and took Arcangelo's hand anyway.

Then the machine that measured their wavelengths drew a slightly different graph.

"Huh?"

She blinked. She didn't feel anything leaving her, like when they kissed or he lost consciousness. Yet the machine showed a change.

It meant that, even if she couldn't feel it, her wavelength was flowing into him.

"Just as I expected."

"What is this...."

"It seems like the Detective Urseau is actively moving to stay alive."

Upon hearing those words, a thought occurred to me. A slight tension entered Leila's eyes.

"Even when there are no major issues for survival, do they absorb my wavelength?"

The wavelength of a siren is typically used when they take on a humanoid form, but in some rare cases, their wavelength becomes powerful on its own due to the specific type of host they possess.

For example, there are sirens with venomous hosts. They can create venom from their own wavelength even in their human form.

However, those are a tiny minority.

"Usually, they live without even realizing their own existence, like Nana Arcangelo Urseau."

It's a power that is not even visible to the naked eye. Without a machine, it is impossible to measure.

"Except for sirens with special abilities such as those with venom, the only time they feel their wavelength leaving is during copulation."

That's when they can conceive a child influenced by the traits of their father and mother. However, even then, a siren cannot feel their own wavelength leaving.

The pleasure is too great to be overshadowed by that.

"In many ways, it's unexpected. From the start, the idea of a venom that attacks the siren's wavelength was unprecedented."

"It's the job of a thesis advisor. In many ways."