In the No Game No Life world, after obtaining the Suniaster and establishing some rules, Rias opened a passage to that world.
With peace arriving, this world of endless internal strife should finally face the vast ocean.
Returning to the High School DxD world, Rias arrived in the Underworld.
Although her gaze was mostly on the Human World, the Castlevania in the Underworld was her main base in this world.
"Ding-ling-ling~"
Such a sound rang in her mind. Rias blinked, and a virtual screen appeared before her.
Every life that came to the Castlevania would have a Castlevania mark on them, representing their status as a resident, temporary resident, or visitor.
This mark didn't just represent identity; it could also load into the Castlevania's virtual system, allowing for calls and other data transmissions.
On the virtual screen before Rias, there was an avatar, with an ID and name annotated below.
Sona Sitri—
"Good morning, Sona-chan~"
Connecting the call, Rias gave a greeting full of smiles.
"Morning? Look at the time."
Sona's image appeared before her. She lightly touched her forehead, revealing a helpless expression.
"You didn't just crawl out of some woman's bed, did you?"
To Sona's words, Rias put on a saddened look and said, "I was doing serious business, like saving the world. Am I really that kind of woman in Sona-chan's eyes?"
Rias indeed went to save the world.
Although there were group members in Rias's world, causing time to flow normally, Rias hadn't been gone for long.
Crushing the War God, using the Suniaster to restore the planet, establishing rules, opening the passage between the two worlds, and delegating tasks.
Though there were many things to do, Rias resolved everything in less than half an hour.
Half an hour is just enough for an ordinary woman to wash up, but Rias wasn't an ordinary life; she smelled sweet all day long and didn't need to wash up at all.
So saying Rias just crawled out of bed wasn't actually wrong.
And, she had just crawled out of her sister's bed~
"Ugh... if it wasn't for the last time you made me and my sister together... Hmph, I almost believed you."
Sona puffed out her cheeks.
"Ehehe~"
Rias acted cute and said, "Sona-chan's voice is also quite nice."
"What do you mean 'ehehe'! Don't say such embarrassing things!"
Sona, wearing glasses, gave off a cold and elegant vibe, yet this blushing appearance sparked a desire to bully her mercilessly.
"Didn't you start this topic?"
Rias tilted her head, feigning confusion.
"..." Sona's body stiffened, and she couldn't help but feel annoyed.
As they spoke, the topic had drifted in this direction.
"I have serious business this time."
Sona took a deep breath, suppressed her shyness, and then said, "Recently, some bad phenomena have appeared in the Underworld, and many students have been affected."
"Some students have already come into contact with bad things, believing that gods and demons should enslave other races instead of letting humans be the mainstream as they are now."
"Oh, that. I already know," Rias said calmly. "Just some trash making a final struggle without even realizing it."
"How much longer will the influence last?"
Sona frowned slightly.
"A month at most."
After a school that didn't distinguish between races or between nobles and commoners was established in the Castlevania, Sona came to study at this school.
Not just Sona, but many Pure-blood Nobles also came to study here.
Some were members of Pure-blood Devils families with other motives, while others were attracted by the beliefs of the Castlevania or simply came for the educational resources.
As the first batch of students graduated, many chose to become teachers, conducting basic teaching while pursuing further studies.
But until now, all aspects of the Castlevania were still supported by the Crimson Butterfly.
With teaching conducted by Transcendents, Dragon God Level, or even higher Crimson Butterfly, even the stupidest student could soar to the sky.
And Sona was also an extremely outstanding student among them. Thanks to Rias giving her the green light, Sona was much stronger than in the original work.
She still became the Student Council President, but the prestige of being a Student Council President among humans versus one in the Castlevania school was on completely different levels.
It was also because Rias gave her a lot of authority that she could notice many things of a deeper nature.
"Hmm... if it's a month, it shouldn't have too much of an impact."
Sona calculated and said.
"Sona-chan is truly serious and responsible."
Rias teased, "What are you doing, working in the student council room? Do you want to sit on my lap while you work?"
"Rias-chan!!"
Sona's face turned red, and she made a fierce expression, saying, "I don't want to! Serious business and that kind of thing should be done separately!"
"I think it has a different flavor that's quite exciting."
Rias licked her lips.
Looking at her rosy lips, Sona couldn't help but be drawn in, a surge of desire rising in her heart.
Really, don't cause trouble while someone is working.
She felt shy about her own heartbeat, especially imagining herself enduring tremors while reviewing documents at the front, while Rias's lips were pressed against her neck and smooth back.
Just imagining it made Sona's body tremble uncontrollably.
"Is your heart racing?"
Rias keenly noticed this and showed a playful smile.
"It is not."
Although Sona pretended to be calm, how could she hide from Rias's eyes?
"I'm stopping now. I need to continue working. Don't come looking for me."
Sona glared at Rias and then hung up the phone.
She even specifically 'reminded' Rias not to go look for her. Was this an invitation?
Rias showed a bright smile, then flashed and arrived at the student council room.
Since it was a school for demons, there were many student matters.
The system wasn't like the Japanese one but was similar to a workplace office.
So the student council room was very large; besides the area where members worked, there was also a private room for the Student Council President inside.
Ordinary matters were handled by students, and only those that were truly difficult to handle would be dealt with by the Student Council President.
Even so, there were too many things to finish.
Because most matters handled by the Student Council President were extremely troublesome.
For this reason, Sona both wanted to be close with Rias and worried about not having enough time to handle official business.
"Your conflicted look is also very cute."
Appearing behind Sona, Rias leaned down, her head pressing close.
As if she had long expected Rias to appear behind her, Sona's body trembled slightly, but she had no other reaction.
But Rias noticed that the door to the room was locked, and a Soundproofing Magic Circle had been activated.
"So you really were inviting me?"
Rias licked her earlobe and laughed.
"You came uninvited."
Sona said stubbornly, then narrowed her eyes slightly, revealing an expectant expression.
Seeing this "at your disposal" appearance, Rias's smile became even brighter.
The documents on the desk were neatly arranged, piled on both sides and in front, yet leaving just enough room for a person to lie on it.
Just crawling out of the sister's bed and immediately about to play games with the younger sister in the student council room—this feeling was exceptionally stimulating.
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