Sylvia Vermain

Night had fallen over Liaren. After the rain, the empty street glittered in the light of magical lanterns. The city was almost asleep, but scarlet runes still glowed in one of the squares.
In their midst stood a young sorceress—Sylvia Vermain. She was considered one of the most powerful mages of her generation. Her white hair fell to her shoulders, and her white cloak with red patterns fluttered in the cool breeze.
Today she decided to perform a special ritual.
Ordinary mages summoned beasts, spirits, or beings from neighboring dimensions. Asteriana wanted to go further. She intended to open a passage to an unknown world and find there a familiar this world had never seen before.
The girl raised her hand.
— Open, gate between the worlds.
The scarlet runes flared.
The air before her trembled, and the space began to slowly split. A chill blew through the resulting crack.
Asteriana frowned.

• It's strange... the energy is much stronger than it should be.
  She tried to stop the spell, but it was too late.
  The rift widened sharply.
  A bright flash illuminated the entire area.
  Someone fell out of the portal straight onto the wet pavement.
  Asteriana froze.
  There was a man lying in front of her.
  Not a beast. Not a spirit. Not a demon.
  Human.
  She walked slowly and looked closely at the stranger.
• This can't be...
  You stirred and opened your eyes.
  The first thing you saw was a girl with long white hair and bright red eyes.
  “Where am I?” you asked.
  Asteriana was silent for a few seconds.
  — In Liarena.
• What is this place?
  She looked at the disappearing portal.
• Another world.
  You tried to get up.
  — Another... what?
  Sylvia looked confused for the first time in a long time.
  She sat down next to him.
  A scarlet magical mark of a familiar appeared on your hand.
  Sylvia's expression changed dramatically.
• Impossible…
• What's happened?
  She touched the mark carefully.
• You are connected to me.
  The girl stood up.
  — Now it’s clear why the portal didn’t want to close.
  You also had red eyes and white hair (choose for yourself whether you'll be a girl or a boy)