Yurii Timee :)
For now, I will focus on Serafall and see the development if it is good I will add some people.
For Harem it will be only 3 or 4
Here is the Candidate:
1) Koneko
2) Kuroka
3) Le Fay
4) Gabriel
5) Rosewaise
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The Peace treaty is successfully completed after Yukari and Vali vanished from Kuoh Academy. Even though Azazel knows the woman's name and race, they still don't know how to search for her since they are curious about the woman who has the ability to effortlessly defeat two opponents with Satan-class power.
On Yukari and Vali's side, after Yukari knock out Vali she takes him to their base in Underworld. Vali who gets his consciousness back sulks because Yukari disturbed him while was fighting his rival but Yukari says 'He will get a chance to fight him in the future when Issei gets stronger' his mood is back.
"Nyahaha…I didn't expect you to lose Vali" Kuroka teasing Vali because Vali nearly lose to Issei
"Fufufu… It's because you underestimate your enemy" Say Yukari
"Hmm… He is only lucky because He can absorb Albion's power plus He also has Dragon Slayer Sword"
"Ara~ Is the great White Dragon Emperor looking for excuses when you lose?" Yukari said with her usual grin
"..." Vali can only keep silent because if He reacts then it only makes Yukari tease him more.
Not getting the response she expected Yukari could only shrug her shoulders.
"So from now on what should we do?"
"We will search for strong people and fight them, but first I have some business with Asgar" Vali replied to Yukari
"Hou…what your business with them?"
"I challenge God of Thunder Thor and he accepted"
"Well, Thor is rather Battle Junkie God so it perfect for you"
"Yeah, so for now You all feel free to do your own business"
They all conduct their own business after that. When Yukari realized she had nothing to do but relax, she recalled that Comiket would be taking place in the human world and that if she went, she may run across Serafall. Recalling Serafall's adorable response at the moment, Yukari grinned and slipped into her gap.
Human World -
Serafall, who has been busy due to the peace treaty, has a day off today because she wants to go to Comiket, an event that takes place in the Human world. It will be impossible for Serafall, who is obsessed with Magical Girl, to miss this occasion.
Serafall, who was standing for the comiket participants as they took her picture, suddenly noticed a golden gleam. She then remembered the image of the woman with golden hair who had always come to her. She blushed unintentionally as she remembered the sweet sensation on her lips at the time.
Shaking her head, she turned her face in the direction of the golden gleam and saw a woman with golden hair, dressed in a purple outfit that matched her eyes color, smiling at her.
"Fufufu… can I get a picture too?" Yukari said and take out the Camera
Serafall suddenly felt embarrassed. She usually wouldn't feel embarrassed when people saw her or took her photo when she was wearing a magical girl outfit but when Yukari wanted to take a photo of herself, her face suddenly turned red.
She continued to pose even though she was embarrassed since she was proud to be a magical girl.
After the photo session ended, Serafall and Yukari went to the cafe to talk.
"Why are you here?" Serafall asked Yukari who was smiling while holding her coffee cup
"Fufufu... I just came to take a cute photo of a magical girl" Yukari replied and drank her coffee while enjoying the embarrassed expression on Serafall's face.
"is that your only reason?"
"Of course" Yukari answered without any hesitation leaving Serafall at a loss for words.
"By the way, we haven't introduced ourselves yet, have we? My name is Yukari Yakumo, nice to meet you"
"uh..my name is Serafall Leviathan, nice to meet you too"
"Fufufu.." Yukari chuckled at Serafall who was still wary of her
'I don't know why but I like to see her reaction and state when she is wary of me, is this how Yukari feels when she pranks Reimu and plays as a villain' Yukari thought.
Yukari then suddenly stood up and approached Serafall, seeing Yukari's actions Serafall increased her vigilance but Yukari brought her face closer to Serafall. Not knowing what to do and remembering when Yukari kissed her, Serafall's face turned red and she closed her eyes.
But the thing she was waiting for didn't come and she felt Yukari's hand on her hair
"Fufufu... you have a leaf in your hair"
embarrassed because she mistakenly thought Serafall face was red like a tomato.
"Ara~ why you embarrassed? Are you perhaps imagining something lewd?" Yukari grinned
Serafall who felt embarrassed quickly denied it with a red face
"No, of course not"
Seeing her cute reaction, Yukari wanted to keep playing pranks on her.
"Fufu... then why is your face red?"
"In..it's because it's hot right because I'm hot"
"Ara~ is that so I didn't know that a Devil King who specializes in ice magic would feel hot"
Serafall's face turned red like an octopus and looked like she was about to let out steam. Feeling quite satisfied with Serafall's reaction, Yukari decided to stop for today.
"Fufufu...let's just leave it like that"
Serafall who was already feeling so embarrassed could only lower her face. This action was unthinkable for the girl who always shouted that she was a magical girl in public.
"Here try reading this book, when you're interested in it you can call me...fufufu" Yukari said and handed Serafall the thin book she bought at Comiket.
"Eh..?!?" Serafall who was still embarrassed took the book and saw the cover which depicted two girls kissing each other immediately felt embarrassed and wanted to return the book to Yukari but Yukari was no longer there.