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Su Yang had known the moment he saw her. That was why he did not particularly like Serafall.

Unfortunately, he did not yet have the standing to speak to Serafall face-to-face, so he let her in.

"Nothing much. I just played a game of chess with Sona."

"Oh! So Su-kun beat Sona in a one-on-one chess match?"

Serafall looked utterly admiring. She truly admired him, because from childhood to adulthood, she had never seen Sona lose at chess.

Even Sona's former fiancé had been reduced to tears by her peculiar methods of playing chess, then voluntarily called off the engagement.

"Yeah, that's right."

"So... Su-kun must be very good at calculation and analysis, then? No wonder Sona-chan asked Achuka-chan for that thing... Oh! Right, did you open it?"

"I suppose I've used it. I really have the President to thank for it."

Su Yang knew Sona had obtained this thing for him. He just did not know what price she had paid.

"That's right, so you need to work hard for Sona-chan~~~ Sona-chan made a promise as the head of the Sitri family for your sake!~"

Serafall set the Magic Wand in her hand on the sofa beside her.

"Hm?" Su Yang narrowed his eyes slightly.

All right, it seemed Serafall had come for exactly the reason he had imagined: to win him over... or perhaps play the emotional card... or perhaps give him a warning.

"This is already the biggest bargaining chip Sona can offer~~ After all, she is only the Sitri family's next head right now. Such a promise might cause the Sitri family to make the wrong decision at certain critical moments in the future."

Serafall waved her hand, though a serious glint flickered in her pink eyes.

In truth... this alone was not enough.

When Ajuka had told her, his Sister, about it, she had also paid a price to successfully obtain Ajuka's thing.

"Mm. I will remember Sona's help for the rest of my life. Whenever she needs my help, I will not hesitate to act."

Su Yang spoke just as seriously.

He was someone who valued relationships. When others treated him well, he would even repay them double.

Sona had truly shown him both kindness and sincerity. Even in this place filled with wandering devils and Fallen Angels, he had not encountered a single one.

Part of that was because he had avoided them using his own algorithms, but Sona must also have been protecting him in secret. She did not want a Student Council member to be unable to attend school the next day because of some wandering devils not even worth calling trash.

Sona Sitri... no, Sona Sitri had treated him very well. He would remember that forever.

"So, do you want to become Sona-chan's Servant? Not only can you gain a lifespan of ten thousand years, you can also increase your strength!~~"

Serafall said excitedly.

That was the true reason she had come to Su Yang's home!~

She did not care about Sona saying things like, "Don't go disturb Su Yang for now, Sister, just go back to the Underworld." After taking such a huge favor from her Sona-chan, he belonged to Sona-chan for the rest of his life!~~

"Become Sona's Servant? In other words... become a devil?"

Su Yang narrowed his eyes.

So she had finally revealed her true purpose?

"Mm, that's right~~ Just think about it: a lifespan of ten thousand years, a chance to stay with Sona-chan forever, becoming Sona-chan's Servant... you might even gain territory, you know? The Sitri family does have just a tiny bit of land—about the size of a small country."

Serafall proudly puffed out her chest.

To you humans, Sona-chan is the princess of a small country, you know? She might even become its queen in the future.

Since she had become a Demon King and changed her name from Serafall Sitri to Serafall Leviathan, she could no longer inherit the Sitri family's territory.

"No, not for now. I have no intention of giving up my human identity yet."

Su Yang smiled.

The Sitri family's territory? With strength, what could he not have?

If I had the power of the Infinite Dragon God or the Red Dragon God Emperor, who would dare object if I declared the entire world my territory?

"Eh?!~~ Why? Sona-chan has clearly done so much for you?!~~"

Serafall could not believe it. Did he think he was so high and mighty? Sona was the younger sister of a Demon King!~

Su Yang: I do think I'm on a very high level.

"I will always remember what Sona has done for me. Whenever she needs me, I will definitely help."

Su Yang gave his promise with great seriousness.

"You don't want to become Sona-chan's Servant? Even though Sona has done so much for you?!~~" Serafall stared directly into Su Yang's eyes.

Had Sona-chan misjudged him?

"I am willing to repay her feelings. I just do not want to become a devil."

"Also, this Magic Wand is pretty nice..."

"Hm? What do you mean, the Magic Wand is nice?"

Serafall looked across from her, but Su Yang was nowhere to be seen.

"Hm??!!~"

She turned to the side, only to find that Su Yang had somehow already appeared beside her!? He was fiddling with her Magic Wand?!~

"I just wanted to say that if I want to leave, no one can stop me. Serafall, you surely do not want to force me onto the side opposing Sona-chan, do you?"

Su Yang said with a smile.

"..."

Serafall silently watched Su Yang. With her strength at the peak of a Demon King, she had not even noticed when Su Yang had come to her side?!

"Oh, right. If you want this Crystal Ball back, I can return it to you tomorrow."

Su Yang added.

He could not finish learning all of Ajuka's knowledge in one day, but using the Copycat Eyes to copy it all in one night and relying on his exceptional memory to retain it would be absolutely no problem.