In DxD with Sign-In System!

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"Phew... It's finally over."

I sheathed Zangetsu and took a deep breath.

But as I looked around at the dismembered limbs and the thick, coppery smell of blood in the air, I couldn't help but think of a certain someone, and a shiver ran down my spine.

[Ding! Task completed! Congratulations to the host for obtaining four White Grade sign-in gift bags.]

[Ding! Task completed! Congratulations to the host for obtaining one Green Grade sign-in gift bag.]

Just as I was resolving to "Reform" myself, the system's voice snapped me out of my thoughts.

I hadn't expected to receive five gift bags this time. I was surprised that the two random Fallen Angels each yielded a White Grade gift bag. Raynare had dropped a Green Grade gift bag, and combined with the one from killing Freed, I now had four White Grade gift bags and one Green Grade gift bag.

Well, the rewards weren't particularly high-grade, but every little bit helps.

[White Grade gift bags opened... Congratulations to the host for obtaining: Peak Magic Power Enhancement Card, Grimoire, One-Time Use Training Room, and 100 million yen]

These rewards were a bit unexpected. I didn't really care about the last one, as it was the lowest grade reward. But the first three were surprising, especially the first one, which solved my current lack of magic power.

As for the other two, I had my own plans. When the time came for the "Rating Game" against the House of Phenex, I would use the One-Time Use Training Room to give Rias and the others a power boost to prepare them for Riser Phenex.

As for the Grimoire, 'hehe!'

....

Things were looking up! Now I was even more excited about the Green Grade gift bag from Raynare.

[Green Grade gift bag opened... Congratulations to the host for obtaining: Abyss Demon Party Invitation]

"What... is this?" I couldn't help but ask.

[Ding! This is an invitation to a party hosted by the demons of the Abyss. You may invite up to four guests. Participants can challenge randomly appearing demons or their clones. By defeating them, participants may obtain special rewards. (Note: Death or failure in the challenge will have no consequences in the real world. There is no danger.)]

"Holy crap, isn't this like opening a mystery box? This is awesome!" After hearing the system's explanation, I couldn't help but curse in excitement.

This was an incredible reward. After all, the random rewards could potentially be on par with or even surpass Longinus.

In short, I had hit the jackpot!!

"System, use the Peak Magic Power Enhancement Card." I mentally commanded the system.

[Ding! Magic Power Enhancement Card used. Congratulations to the host, your magic power level has reached the Peak of High-class.]

After a few seconds, I slowly opened my eyes, carefully sensing the changes within me.

"Not bad. This feels great!"

I could clearly feel the increase in my magic power. Now, even without using my trump cards, I could be considered the strongest person below Ultimate-class!

....

As I stood before the church statue, seemingly lost in thought, Asia remained silent for a long time.

"Kyoya-san! Are you alright?" Finally, Asia rushed to my side, worriedly checking me for injuries. She still hadn't fully processed what had happened.

"All taken care of. You can relax now, Asia-chan. From now on, you'll stay with me." I said reassuringly.

"Yes! Thank you, Kyoya-san!"

The girl who had been so lost and disheartened was now smiling brightly at me. From now on, the person who had saved her from the depths of despair would be her whole world.

It was almost midnight when I finally led Asia back towards my home.

As we walked and chatted, I suddenly remembered that I had only completed half of the system task related to Asia. I still needed to make her my adopted sister. But considering how much she relied on me now, it should be easy...

So, I turned to Asia and said, "Asia-chan, I have a favor to ask. Would you be willing to do something for me?"

"Hm?"

"Kyoya-san, please, just ask! Is there anything Asia can do for you?"

Although a little confused by my sudden request, Asia, based on her near-total trust in me, agreed readily.

Seeing the earnest expression on her face, I took a deep breath and said gently, "Asia-chan, I want to adopt you as my little sister. That way, we can live together properly."

"!!!"

Asia was surprised, but then she thought about being able to live with me, her new family, and a gentle smile spread across her face.

"Yes, I understand, Kyoya-san."

Hearing Asia's agreement, I smiled. But then I pretended to be dissatisfied. "Asia-chan, now that you've agreed, shouldn't you change how you address me?"

Asia froze for a moment, then seemed to realize what I meant. She nodded shyly and said, "Th-then... Onii-sama..."

"Haha, that's right. Let's go home!"

I grinned, satisfied. I still wanted her to call me "Onii-chan" to fulfill a wish from my past life, but that could wait. There was plenty of time. I would eventually get her to say it.

Just as Asia agreed to become my sister, the system notification for task completion rang out.

[Ding! Task completed! Congratulations to the host for obtaining the Green Grade sign-in gift bag: Elementary Bloodline Enhancement Card. When used, it can slightly enhance a bloodline.]

This time, I had received a bloodline enhancement reward. Not bad. A bit unexpected.

This card wasn't very useful to me at the moment. Maybe it would be better for Rias, Akeno, or Koneko. Rias had inherited her mother's Power of Destruction.

Akeno had inherited her father's, Baraqiel, Holy Lightning, as well as the bloodline of a Fallen Angel. Though for some reason, she hated her father.

As for Koneko, she was a Nekoshou, a powerful type of Japanese youkai, specifically a cat youkai. However, she was burdened by her sister's past and refused to use her Nekoshou powers.

After thinking about it, only those three seemed like suitable candidates. I would find an opportunity to use it on one of them in the future.

It seemed like today was my lucky day!

Not only did I get a lot of rewards, but most importantly, I gained Asia as my "Adopted" little sister. Yes, "Adopted" in every sense of the word.

.....

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