The anime based on "Sonic the Hedgehog" video game series, mainly the "Sonic Adventure" series, where Sonic, his sister (Y/N), and his friends are being transported to Earth, where they meet and befriend a 12-year-old boy named Chris who rescued Son...
It is nighttime and Y/N is sitting on the roof of the mansion staring at the stars in the night sky. As she was stargazing, she suddenly felt something in her backpack and took it out to reveal her diamond shaped crystal glowing white. Y/N had no idea what's happening until the light went brighter, surrounding her like she was being pulled in. She closed her eyes shut for any impact, but nothing happened to her. She slowly opened them to find herself in the strange area with bright blue sky from top to bottom like she's in the sky. Right behind her is the Tree of the World and of the Apple. From the top, there's what appears to look be a glass roof with a colorful windows and it's spinning around like it's a Room of the Time.
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"It's...beautiful.. And strange.. Did the crystal bring me here?" she asked herself and looked at the crystal in her hand. "What's going on?"
Y/N stood there for a moment and noticed the apple was about to fall from the tree and she quickly caught it. She looked at it to see a beautiful red apple that shines like a sun. She doesn't know whether or not she should bite it and made a quick decision and placed it on the ground gently. Everything was quiet and peaceful. Then, her crystal glowed bright again and the light covered her once again. Y/N found herself back on the roof where she was sitting. The crystal stopped glowing.
"Woah.." she said and put it inside her backpack.
She was about to go back to get some rest when she saw something flying. It was someone flying with a familiar bat wings. No bats should fly in the city. Odd. Y/N followed after the mysterious person and jumped off the roof onto the gate to every building she could jump and run on. When she made it and caught up to them, they're in front of the museum as the figure is hanging upside down in a tree. Y/N couldn't make out who this person is because it's dark. The mysterious figure looked through their jewel scope before taking off in the direction of the museum. Y/N quietly followed behind as they went inside.
Once they're in, Y/N noticed there's cameras watching and this person doesn't care. She quickly took out her ninja stars and threw them and destroyed the camera. She then ran after that person and saw them approaching the jewel. Y/N squinted her eyes and was shocked to see the person is the bat, but not just a bat. It's Rouge. How did she get here?
"Hello, gorgeous..."
Rouge cleanly slices the glass casing with a swift kick, then picks up the jewel. Y/N need to stop her and took out her whip and lassoed towards the jewel and took it, surprising Rouge.
"Stop right there, Rouge. That jewel doesn't belong to you."
"Well, hello, Y/N." Rouge flirted. "How delightful to see you again. I guess fate has brought us together."
This made Y/N blush for some reason.
"I see that you're transported here too. You always look for jewels to steal."
"You got it right, darling."
"I suggest you leave where I put this jewel back where it belongs."
