After saving my sister, I simply left the building I was in and moved to another one, just in case she wanted to come to check on me, as it wouldn't be too difficult for her to track the trajectory of the shot.
Of course, after that, I continued observing to see how she would react. She spent some time looking at the area of my shot, and I also noticed a strange black liquid.
"Demon, what is that black liquid where my shot hit?" I question the demon with doubt. When I killed the first monster, there wasn't this strange liquid at the point of impact.
"It's your obsession," the demon responds, as if it's no big deal while licking the fur on its body like a real cat.
"...Explaining things properly is a gift," I murmur dissatisfied so that he can hear and speak more completely.
"Okay, okay Setsuna, I'll tell you correctly. Magic girls draw more power from their feelings, and obviously, this influences the properties of their powers, whether in color or the effect of the magic."
"This black liquid is your feelings, more precisely your unhealthy obsession with your sister. It's just visible because you used it as fuel for your attacks."
"It doesn't mean you're losing your feelings, it just means your obsession with your sister affects your magic, making your feelings visible. And I must say, it looks disgusting, hahaha!"
"It's simply a black, highly viscous liquid. What do you think of seeing what your feelings are like? It's creepy, isn't it?" the demon says with malice.
"..."
'My...feelings...are not quite what I expected, and my sister seemed uncomfortable looking at that liquid...' As I imagined, she would never accept my feelings.
This kind of hurts. She looked at my feelings and felt uncomfortable with them, so knowing that this is a representation of my feelings doesn't make me angry or scared, it just hurts to know that my sister feels uncomfortable with my feelings.
"What do my feelings do to my 'magic'? You said they apply effects."
"Basically, from what I can tell, your current magic with the weapons, when bathed in your feelings, corrodes things. It doesn't seem to have any effect on you or your sister."
"So I can say that your current magic is similar to a powerful acid that has different properties."
"I think it's because the only thing that matters to you is your sister, and nothing else has any value. But of course, that black liquid also seems to have the property of trapping things and sticking them together, I guess it depends on what you're feeling."
'This makes me think...why did this demon come after me and offer me a contract...'
"Demon, why did you offer me a contract?" I ask him as I make the sniper-style rifle disappear since my sister has started to return home.
"Who knows, hehe. Why don't you try to figure it out, Setsuna?" the demon says in a malicious tone while leaping to the side of the building as I begin to follow my sister, jumping from building to building carefully.
'My feelings affect the magic that my weapons shoot...a corrosive liquid...' I won't complain, this is actually good.
The stronger I am, the easier it will be to protect my sister, and having my magic have the properties of a strong acid helps a lot to eliminate various opponents, especially stronger ones than me.
I just think there are many secrets I don't know about that need to be discovered in the future. There are so many things to think about and so many enemies to eliminate.
As I follow my sister, I end up seeing another magic girl jumping across the buildings. It seems that the ability to fly is a luxury among magic girls.
"I can't see clearly..." She's gone, disappeared between the buildings too quickly to get a good look. I wonder how many magic girls exist and also why the world almost ended.
Thinking about it, I don't know why that whole thing with a massive monster invasion happened all over the world, and it seems that in each country there are magic girls protecting the general population.
'I need to protect my sister...she can't get caught up in this invasion. If the world ends, I don't care as long as she's safe.' I think about this as I watch my sister remove her magic girl outfit near her house and quickly run inside, locking the door behind her.
She's probably safe for now, so I descend to go to the school to ask to take the test. It must be around 9 or 10 PM, so if I start the test tonight, I should be able to finish it by tomorrow night. I start jumping from building to building while talking to the demon that's following me.
"Demon, could you create a fake identity for me with your powers? And help me cheat on the test?" The demon clearly lets out an evil little laugh.
"Are you willing to pay? Creating a fake identity will be costly since it will be in the government's database and the memories of the people who control the government data."
'So it's not even a fake identity anymore, he's literally creating a real identity from scratch.' This is incredible and a bit terrifying. Knowing that this demon can control things to this extent has a huge weight.
It literally means that if this demon wanted to, it could start a global nuclear war by posing as the president or using magic to manipulate everyone to activate the nuclear missiles.
It could even activate them itself using magic, having the ability to add data to government servers.
"Okay...of course I'm willing to pay for that...do you want something specific or just for me to be evil?"
"I want something specific. I need you to be evil at school as well. I know that if I don't ask for that, you'll act like a perfect little saint, but that's not what I want."
"Whenever possible, you should be mean at school to pay me back for what I'm giving you. I'm investing in you and I want returns. If you want to act good, just do it in front of your sister."
"But whenever possible, be mean at school. If you do that, consider the payment for your identity taken care of."
'Be mean at school...' This damn demon really knows what's up. I would have just lived a "normal" school life while acting like a good student.
'Why does this demon want me to be so mean?' This doesn't seem necessarily like a payment, it seems more like this demon wants to make me be bad instead of just a demand.
I say this because being mean at school would never equate to killing people, meaning this demon isn't asking for this act of evil to gain power from it. The only option left is that this demon wants to make me mean.
"Okay, demon, it doesn't really matter anyway...I accept being mean at school." In exchange for a real identity and help to cheat on the most difficult test, this request is relatively cheap.
"Okay!! Setsuna Shū is an orphan girl who grew up in an orphanage that was demolished. She's 18 years old, turning 1 January, with unknown parents, blood type AB+."
"Born on January 1, 2020, in the city of Eldoria in the country of Eryndor, the territory of the old Japan, female gender...I think that's enough for you to know, right Setsuna?"
"...Okay..." It's much better than I thought it would be. This also means that today is my birthday. He really created a little backstory.
"You adjusted my school record, right?" I ask one of the most important parts.
"Yes, I adjusted that. And for everyone, you've already attended a school, and there are records of that. You're also smart and have genius-level grades at school since you'll be cheating on the test, and your background needs to be good."
"Okay, demon, I trust that everything is in order." This demon is not trustworthy, and nothing guarantees that he will keep his agreements, but apparently, this demon is obligated to fulfill any agreement he makes.
It serves as a safety measure, as I and this demon are obligated to fulfill our parts or suffer a punishment that I don't know exactly what it is.
In fact, I don't know almost anything about this demon. I don't know its name, I don't even know where it came from, and I don't even know its gender, since the first cat body this demon used to come see me was male.
But the current one is a female cat body. I decide to leave that aside, I shouldn't meddle where I wasn't called, after all, curiosity killed the cat, so the less curious I am about it, the better.
"Demon...could you give me some free clothes? Don't be so stingy, okay?"
"Clothes...okay, I'll give you some clothes for free, it's no big deal. But I'll only give you one to wear now, and it will be a relatively simple outfit, just a dress, shoes, and common accessories."
"The rest you'll have to figure out on your own. If you want more clothes, you'll have to steal them from somewhere or something like that." As we've been talking about this, we've arrived near the school.
"Okay, give me my clothes." I start undressing on top of the building. I don't feel ashamed of doing this in front of a cat, it's not something surprising or anything.
"..." I take a look at my breasts. They are very beautiful. I hadn't checked my naked body yet, and I must say it's like a work of art with curves in the right places.
'I'm very beautiful...' but I guess it doesn't matter. It's not like I'm going to use this beauty, I may have turned into a girl, but I don't like men, and the only person I like is my sister.
So being so beautiful doesn't help at all, or rather, it only helps if it's to deceive others, and that's the only way this beauty will be useful to me.