Named and based from the song STYX HELIX by MYTH & ROID (Re:Zero ED)

Elsa and Jack known since childhood, and they are in the same age of 18, she also snuck outside the castle to meet him. He was cheerful, sarcastic, and boisterous boy. While Elsa is elegant, shy, and graceful. She even showed him her powers. But one fateful day on an icy lake Jack and Elsa were skating but then the ice started to crack.

"It's alright Elsa, look at me" Jack said

"I don't know what to do, Jack." Elsa said.

"Ummm let's see…. I can grab at stick and I can catch you."

"Jack, I know the ice is cracking but I can restore it" Elsa responded

"Let's get out of here without your ice powers" Jack said.

"Okay, I believe in you, Jack" Elsa replied.

"Thanks" Jack hops to the stick and catches Elsa but the ice cracked and Jack feel underwater. Elsa was shocked and her ice power jolted and restore the ice lake.

Elsa trying her best to unfreeze the lake but due to her powers and emotions she cannot control it and Jack is drowning underwater and shed tears for him.

The following days her parents died in a shipwreck and she lost three persons she cared about. Then she stays in her room for days.

Then a day later in that fateful night. Jack Frost was born from a frozen lake. Grabs his staff and starts channeling his powers. And when he flies to a nearby town in Arandelle, they cannot, hear him, see him, and feel him.

"Hello!? What!? What the hell is happening!?" Jack was confused and concerned for himself.

Flies again and goes to the royal castle, he sees Princess Elsa and she starts conjuring her ice powers.

"No way, she like me. Hey miss." Jack called her but she never looked back and when he touched her hand, it went through like a ghost.

"I miss you, Jack. I don't know what to do. My parents died, my relationship with Anna is shattering, and you were gone too. I don't want anyone I cared about dying on me" Elsa cried

"My name is Jack. Is it me you're referring to miss?" Jack tried to call Elsa but she cannot hear him.

"I don't know if you can hear me, but I will be here. Always." Jack said. Poked his staff on a tree and conjured frost and flies away.

Elsa felt the wind and see something peculiar "What? Frost? I didn't do that."