Black cat Fanfic Chapter Five- A worried Cat

Sven and Amy had turned in for the day, and were staying at a simple bed and breakfast. Amy had gone out onto the roof-tops, getting overly excited about tiny things as she usually did. Sven wondered if it was because she couldn't remember going outside before, or if she was just usually like this... It was strange how she liked all the things Train did, and she was also, like Train, very happy-go-lucky. Again, he found himself thinking they would be good friends.
"Sing a song onto the world,"
Sven looked up. Someone was singing.
"Rising high, the clouds unfurl,"
It sounded like a distant echo that filled the air, an almost angelic sound to it.
"Fan the flames into the past,"
The sound sounded like it was coming from the roof tops as it floated through the open window. Sven Put down his coffee and found himself going up the stairs to the roof tops.
"Here, now, our lives will last,"
Why did it sound like he'd heard it somewhere before? He thought, just as he was opening the door that led directly to the roof.
"We'll never know the times of pain..."
She was standing on the edge of the roof, her back to him, her dark hair fluttering gently in the breeze.
"Fall down, fall down, falls the rain..."
She sang, and it seemed like the sound sung across the starry sky.
"My life won't be plain."
The song finished with an echo across the town, and the silence that listened when she sang finally broke when the sound of the final note died away. Amy gazed to the right side of her at the next roof top over for a moment, as if she was expecting someone else to be there, then she turned around to see Sven standing in the doorway.
"Oh, Sven!" she said, surprised, but smiling.
"Was that you?" he asked, hardly daring to believe it.
"What, singing? Yeah! I had no idea I could sing, but I guess I'm alright at it!" She laughed then continued, "I just got on the roof-top and suddenly remembered some random song and thought I'd sing it... Hey! That means I've remembered something, right!?" her eyes lit up as if Christmas had come early along with winning the lottery.
"That's great!" Sven said, feeling really happy for her. Did this mean there was a possibility she could get her memories back?
"Hey, by the way, where's that song from?" he asked, feeling curious, although he didn't know why.
"I don't know, the words and tune are the only things I remember so far... But as soon as I get my memories back I'll tell you."
"It's weird, I get the feeling I've heard it somewhere before, but I can't remember where."
"Welcome to my world!" Amy laughed.
Sven looked at his watch, and was surprised to see how late it was.
"We should get some sleep. We're gonna have to get up pretty early if we want to get out of town before noon tomorrow." He said, "I think the best plan at the moment is to keep moving so the Apostles can't get us in a corner we can't get out of."
"Sure!" Amy smiled in an even better mood than she did usually, with the joy of having remembered something, and jumped down from the higher part of the roof-top and landed on the floor next to Sven gracefully.
It was about an hour later, just as Sven was drifting to sleep that he realised where he had heard the song before. He had heard Train humming it to himself occasionally when he thought no one was watching, and although Train wasn't a particularly good singer, the tune was recognisable. When Sven had asked him about the song once, Train had got all defensive, and surprisingly he also looked a bit sad. "So they're both happy-go-lucky, like milk, roof-tops, and even the same song?" he thought, wondering if it was a coincidence or something else. But before Sven could think about it too hard, he fell asleep from the exhaustion of trying to evade the Apostles.
....................................................................................................................................................
Train finished another bottle of milk, sitting on the roof of the sweeper's cafe. Annette had let them borrow the guest room so they could all stay together and find information about the situation. Eve had gone to the library to get some old newspapers so they could try and figure out who the girl with amnesia was.
"I wonder how Sven's doing..." Train wondered to himself as he gazed out at the sky. It was early morning, and the sky was a pale blue and it was slightly chilly. He didn't usually get up this early, but decided to go on the roof because he couldn't sleep. The truth was, he'd been worrying about Sven ever since he rang him up saying the apostles were back. On top of that he didn't want to have to deal with Creed again... "Damn, I thought I'd seen the end of this..." he thought. And who was this girl, anyway? Train wondered why Creed wanted her so much and had put everything else on hold just to find her. It occurred to Train that she might not even be able to do anything Creed's afraid of or hates. He knew all too well that Creed could be delusional... he shuddered away from the memory of the last thing Creed did  to one particular girl after having one of his delusions, and tried to think about something else. A distraction arrived in the form of Eve.
"Sven will not be able to evade the Apostles of the star for much longer." She said as she came back from the library and stepped out onto the roof knowing that was where she would find Train. She was holding not old newspapers but a bunch of fliers and leaflets advertising the celebration for the Mayor being elected.
"Yeah, I've been worrying about that too... We should find a way to help him but I don't know how to do it without giving away their position." replied Train, "Hey, what's that stuff you're holding? Has it got any info on the girl with amnesia?"
"Leaflets for the celebration and dance in Tokyo."
"Ok... is it useful for finding out information about this girl or the apostles?"
"No, but it might help us not give away Sven's position."
"Err... How?"