It was a beautiful day in the Republic of Acorn. The sun was shining, birds were singing, and everything appeared to be peaceful, with no attacks from Dr. Eggman on the horizon. In the middle of New Mobotropolis, Sally Acorn was walking alongside her boyfriend, Sonic the Hedgehog. The brown chipmunk smiled as she held her azure blue hedgehog boyfriend's hand.

"Wow, it's such a beautiful day, isn't it, Sonic?" Sally asked Sonic.

"You know it, Sal! It's the perfect day! No Eggman attacks or anything, just peace! I love it!" Sonic said happily.

"Yeah. You know, I feel like going for a swim today!" Sally said.

"Heh, you go ahead and do that, Sal. You know I don't like water." Sonic replied.

Sally giggled. "Of course, Sonic. I know that you don't like water, so I won't be taking you for any swims."

"Alright, Sal. Be safe, would ya?" Sonic said, chuckling.

"Of course, Sonic." Sally said as she went to Castle Acorn to get some stuff and then made her way over to the nearest lake. She put down her bag that held her stuff, took off her jacket and her boots, and then dove into the lake, going out for a swim.

"How refreshing! A dive into a nice, cool lake is just the way to refresh yourself!" Sally couldn't help but say out loud to herself. She then dove under the water, swimming around underwater. A few hours later, Sally was still swimming around, but she had gotten a little lost. After swimming around underwater for the 30th time that day, Sally went up for air, and found out that she had no idea where she was.

"Where am I? What happened to the lake?" Sally asked herself. She then dove under the water again, and suddenly, she saw an opening to a cave. Sally was rather bewildered by it and swam into the cave. She then went up for air again, and found herself in a cave lit with candles. Sally was confused.

"What kind of place is this…?" Sally wondered. Suddenly, she heard splashing beside her. Sally was startled by it and looked to her right. A white chipmunk with pale green eyes and shoulder length black hair had surfaced next to her. The chipmunk wore a black shell bra as her shoulders, arms and belly were bared and exposed. From above, the chipmunk looked like a regular chipmunk, but then Sally looked down. From below, the chipmunk had a black and white fishtail where her legs were supposed to be. She wasn't a chipmunk, she was a Mermunk! The Mermunk looked Sally dead in the eyes, her eyes widening. Sally's eyes widened as well.

"A Mermunk?! But I thought you were just a myth!" Sally exclaimed.

"What are you doing here?! Quick, you gotta get out of here before it's too late!" The Mermunk said to Sally.

"Before what's too late?" Sally asked. Suddenly, the water in the cave started bubbling.

"Too late, it's already happening!" The Mermunk said.

"What's happening?" Sally asked the Mermunk. Suddenly, she felt a little strange, and she couldn't feel her legs anymore. It's like they were stuck together. The water then stopped bubbling and the water became clear again. Sally then looked down, and saw that her legs had been replaced by a long light blue fishtail with a light blue waistband. She was now a Mermunk herself. Sally screamed.

"I have a tail!" Sally said, scared.

"Yeah. Nice color too!" The Mermunk said to Sally.

"What did you do to me?!" Sally asked the white Mermunk.

"I didn't do anything to you. The Crescent Pool did it to you." The white Mermunk replied.

"What the heck is a Crescent Pool?" Sally asked.

"It's the pool we're in right now. By the way, I haven't introduced myself yet. I'm Arya." The white Mermunk said, introducing herself.

"Sally…Sally Acorn…" Sally replied.

"Oh, you're the princess of the Republic of Acorn and leader of the Freedom Fighters, correct?"

"Yeah…" Sally replied.

"Nice!" Arya replied.

"I have a tail…" Sally said again, still scared.

"Relax, it's going to be fine!" Arya said to Sally.

"How? How will I lead the Freedom Fighters with a tail? What's gonna happen to me?" Sally asked.

"Don't worry about it, all you have to do is dry off." Arya explained to Sally.

"And then I will get my legs back?" Sally asked.

"Yeah. Also, you will only become a Mermunk in salt water, so no need to worry yourself about never being able to take a shower or walk in the rain again." Arya added.

"Okay…What do I do now?" Sally asked.

"Well, you swim." Arya replied.

"How do I swim in this thing?!" Sally asked.

"Let me teach you." Arya said, taking Sally hand as she got into the water.

"Okay?" Sally said as she dove under the water and swam off with Arya.