A/N: Hi! I recently did a project on antisocial personality disorder (ASPD) and I loved it. So I'm using that here. I did a lot of research on it, so I hope my facts are right. Enjoy!

I don't own Vocaloid, but I do own the plot.

Rin woke up and looked over at her twin brother, Len. He slept peacefully on the identical bed next to hers.

"Len…" she whispered.

Len immediately opened his eyes and got out of bed. "Good morning, Rin," he said, yawning. "Get dressed and brush your teeth. I'll make breakfast."

Rin silently nodded and headed to the bathroom. Len stared after her and sighed.

Rin had antisocial personality disorder. In other words she was a psychopath. It was Len's job to look after her and make sure she didn't get worked up and become violent.

Len got dressed and headed to the kitchen.

Their parents had abandoned Rin because of her disorder. Len begged for her to stay, but his parents still threw her out. Desperate not to leave his sister alone, Len ran away. Together, they found an abandoned old cottage that wasn't in bad condition. They made a few adjustments and were soon living in the little cottage.

Len took four pieces of bread and made two peanut butter and jelly sandwiches. Then he poured some orange juice for Rin and got a banana for himself.

They found a school not far from the cottage and applied there. Both of them got part-time jobs at a fancy restaurant. Len was a waiter and sometimes a temporary cook. Rin played the violin and piano for the customers. At first, Rin was also a waitress, but she got mad at a customer once and Len had to stop her from hitting the customer with a plate.

Rin walked into the kitchen and sat down at the table. Len noticed Rin's hair ribbon was crooked and fixed it for her. They ate breakfast in silence.

School passed uneventfully that day. After school, Rin and Len headed to the restaurant they worked at.

"So, how was your day?" Len asked Rin.

"Fine."

It was hard to talk to Rin, but if she wanted to talk, she could be really talkative. However, today wasn't one of those days.

"Welcome to the Classical Grill!" Luka said as they walked in. "Oh, it's you two. Right this way, she pointed to the kitchen.

Rin and Len changed into their work uniforms. Len wore a black vest over a white button down shirt. Rin wore a knee-length black dress.

Len started at a table with a young couple. They both had white hair and red eyes. Would they be albino humans then? Len wondered.

"What would you like to order?" Len asked.

The girl looked up. "Um, this is the first time we've been here. Can you give us a few tips?"

"I'm sorry, I've never actually tasted the food before."

The man looked at Len up and down. "Aren't you a bit young for this job?"

Len flushed. "No, I'm fourteen, the age limit to work here." Len had always been short and people made fun of him because of it.

"Hunh," was all the man said.

"Haku! Dell! Why didn't you tell me you were coming here?"

Len turned around. A girl stood behind him. She had long blond hair tied on one side.

"Neru! Thank goodness you're here. I don't know what to order." Haku said.

Neru slid into a chair next to Haku. "This is really good. Oh and this too!"

Len stood there uncomfortably. Dell took out a cigarette and lit it.

"Oh, sir, you're not allowed to smoke in here." Len quickly told Dell.

Dell glared at him. "I can smoke if I want to."

"I'm sorry, sir, you're not all—"

Dell grabbed Len's collar. "I said I can smoke if I want," he snarled in Len's face. Len gulped.

Suddenly, Dell let out a scream.

"Let go of him."

The voice belongs to Rin. She took her violin and hit Dell on the head with it. He collapsed onto the floor. Haku screamed and ran to his side.

Luka came out of the kitchen when she heard the commotion. It didn't take much for her to understand what happened.

"Out!" she yelled at Rin. "Get out of my restaurant! I can't have such an incompetent worker like you. Get out! I don't ever want to see your face in here again!"

Rin stalked out of the restaurant. Len ran after her. When they were outside, Len scolded Rin.

"Don't act like that in public! Okay, Rin? We need to make money to live here. If you earn a reputation like that, no one will want you to work for them."

Rin started laughing. "What's so funny?" Len asked, confused.

"That stupid lady forgot to make me give back my uniform." Rin grinned. "So now I have a free dress." Giggling, she walked towards the cottage.

Len caught up with her. "You can't do that! That's technically stealing."

Rin shook her head. "No, she said she never wanted to see my face again. So I can't return it to her if I wanted to." She paused. "Which I don't."

"Well, I can return it to her." Len insisted, but he knew it wasn't true. Luka wouldn't want to see Rin or him ever again.

"Hey! You two!" Len and Rin turned. Haku ran up to them breathlessly. "Looks like you won't be working there anymore. How would you like to work for me?"

"What's your job?" Rin asked.

Haku smiled. "I'm a detective. And you two seem like smart kids. Plus," she said winking, "you have to do something to make up for that back there." She pointed at the restaurant where Neru was helping Dell walk.

"We'll do it." Len said.

"Great." Haku stuck her hand out. "My name's Haku Yowane. And you?"

Len shook her hand. "I'm Len Kagamine. And this is Rin, my twin sister," he said gesturing to Rin.

"Twins, huh. Sounds fun." Haku's eyes twinkled. "That back there was my partner, Dell Honne. And the other girl's my friend, Neru Akita."

"I'm a psychopath," Rin piped up.

"Rin!" Len exclaimed. They usually tried to keep Rin's condition a secret unless they had to tell.

Laughing, Haku said it was fine. "See you tomorrow." She handed Len her business card and left.

"Yowane and Honne Detective Agency," Len read. "What do you think, Rin?" Len looked around. "Rin?"

"Hurry up!" she yelled. She was already halfway to the cottage.

Len smiled. Rin was unusually lively today. He loved to see Rin laugh. "Coming!" he yelled back and sprinted as fast as he could.

A/N: Awww, wasn't that sweet? Just kidding. I know that people who have antisocial personality disorder can also be sociopaths, but I researched and I think Rin should be a psychopath.

Thanks for reading!