Emma the Alchemist's Debt Story

At the Saint Michael Girls' School... festivities erupted among the girls of the annex. The reason for their celebration is the Best Couples poll being held at the main campus. The students at the annex, who look up to the girls from the main campus, decided, "Let's have our own Best Couples!"
...It was always inevitable.
And so, the fairest and most intimate couples were nominated...

The first couple is a pair of childhood friends, Misawa Nagisa and Takahata Rina. The second couple is a pair of twin sisters, Kimishima Ai and her younger sister Aya. And finally... The transfer student who saw this whole thing as no concern of hers, Onohara Hazuki, is shocked to hear that she too, was chosen to be among the Best Couples.

Moreover, her partner is the sheltered young debutante, Suoh Manami. Actually, Hazuki has secretly been crushing on the impeccable Manami... But the truth is, they're far from a couple, and while their classmates may cheer them on, it's all in vain.

But then... Hazuki works up all her courage to ask Manami to become a "Best Couple" with her, and...

Hello, this is Mia. When I woke up, I found myself trapped in a strange and terrifying place... I was surrounded by creepy monsters, unpleasant smells and strange sounds. But I have to get away from here. I have to be brave and take one step at a time.
 
...Will you help me?
 
Honestly, I don't know if you'll really answer my questions. But...there's this terrifying whisper in my head that I keep hearing. That whisper tells me that you will definitely help me. And Mia whispers to you some important information to help her along the way:
 
"It's your job to help Mia move forward.
 
But the road is very dangerous...many monsters are trying to attack her.
 
Even so, please don't give up.
 
With my help, Mia can see if the monsters have found her.
 
That information is projected directly onto her retina as a light like a line of sight.
 
I'm sure it will help you.
 
The fact that you've listened this far means that you're interested in helping Mia.
 
I'm going to tell you something very important...please listen carefully.
 
Mia will pass by...↓↓↓

A world where dragons have been hunted to extinction by humans.
The disciple of the master swordsman, Reiri, is still trapped in a nightmare from 15 years ago.
“A hometown turned to stone,” “A black dragon,” “A man playing the flute”…
Just as she had almost given up, thinking there was no way to find out the truth, she receives news that a “black dragon” has appeared.
Unable to stay here any longer, Reiri leaves her familiar home and sets out on a journey.
A journey to face fate, conspiracy, and herself…

The Infinite Sky. The Infinite Earth. A continent that embraced all the world.

At its heart lay the Elven Kingdom of Maradian—a land of abundance and blessings,
a place overflowing with dreams, compassion, love, and joy.

Yet, with the actions of a single traitor, Maradian was brought to ruin in a single night.

Barely escaping with her life, the second princess of Maradian, Artesia,
encountered a lone girl in the human realm.

Her name was Harukaze Sakura.

Was it fate, inescapable and binding?

Artesia entrusted her soul to Sakura,
and together they found themselves fighting against the pursuers from Maradian.

The pure-hearted girl’s soul resonated with Artesia,
and clad in armor born of their bond, she stood against the monstrous foes that pursued them.