"Listen, for this project you will deal with possession. You already know the basics," the teacher declared.

"Meiko-sensei! What instruments can we use?" Miku raised her hand and asked.

"You will have to be able to find the adequate instrument to possess each creature. And remember to always listen to your senpai." Meiko explained.

"Yes!" All the students said as a whole.

Possession was a powerful spell only musicians could cast on different creatures that resembled animals. In order to do so they had to play a melody, but it didn't always work. Sometimes the creature wouldn't be lured by the music and some other times the musician's melody would make it do things he actually didn't want it to do. That was Miku's specialty. She had made countless of creatures run after her once because she played a piece that made them aggressive.

Miku was very excited but she would have to wait until a letter with the instructions arrived in their mail box. Each group had a different mail box that was placed in the school yard, which was basically a forest. Miku had to go and check it with Luka at some point.

"What will you get for lunch today Miku?" Gumi asked as she stared at the variety of foods available in the cafeteria of the academy.

"Umm… I'll have a shrimp sandwich…" Miku said thoughtfully after looking at all the foods.

"Eh? Just that?" Gumi asked surprised.

"Well, I'm not so hungry… and I also have a bento…" Miku explained.

"What are you talking about, girls?" Kaito asked as he sat beside them.

"About how Miku doesn't eat much…" Gumi stated after gulping. Kaito giggled.

"What's wrong with you Miku?" He asked with a smile.

"Umm… It's just that my stomach isn't feeling so well and I feel this electricity…" Miku said embarrassed.

"Oh… umm… do you have a date and you are nervous?" Kaito guessed.

"N… not exactly…" She smiled uncomfortably.

"Miku is nervous about her project…" Gumi explained bluntly.

"Are you that nervous?" Kaito asked puzzled.

"You could say that…" Miku answered unsure.

"Hatsune Miku," Luka intoned as she approached them. "I was just informed that we will need to move to the true house in the forest and wait until our mail arrives there," She said bluntly. Miku's face immediately lightened but then she looked at Luka confused.

"Why… do we need to go there?" She asked.

"I don't know, but it's probably related to the mission of our project," Luka explained. "Many other pairs will go to other places…"

"Oh I see…"

"Tomorrow I'll be waiting for you there," Luka declared.

"Wait… How will I get there?" The girl asked confused.

"Ah…" Luka looked away coldly. Miku gave her a frightened look. "Just take the bus and stop there, simple as that. Tell the driver," Luka instructed her with a dull expression.

"O… okay…" Miku replied. "Thank you." She said shyly.

-o-o-o-

Miku woke up in her room, completely alone as always. She opened her curtains and gazed at the scenery from the tall castle. It was surely beautiful but she hardy knew what mysteries and secrets it could hide. She made breakfast, cereals with dry berries. The bus was about to arrive so she went downstairs as fast as she could before she missed it. She didn't want to think what would happen in that case. Finally, she entered the bus. Of course, today she would be going to the tree house instead of school so the driver was a completely different person she didn't know about. She showed him her student card and when she was to seat in one of the seats she realized that Luka was also inside the bus.

"Hey," Luka said when Miku sat next to her.

"Hello, Luka-senpai," Miku smiled cheerfully.

"You seem very happy," Luka remarked and it almost seemed as though she was complaining. It truth, she was quite grumpy, but that's… something Miku liked about her.

"I've always wanted to stay in a tree house!" Miku exclaimed, looking at Luka, her eyes sparkling.

"This is not a grade school outdoor excursion." Luka argued and Miku looked down disappointed.

"But… even if that's so, there's no hurt if you enjoy a mission while you are doing it." Miku gave a frown smile.

"You need to focus, Hatsune Miku," Luka asserted. Miku wondered why she had begun calling her by her full name, but she didn't really give it much thought as they were already in front of the tree house and had to get down. It was a huge tree with many curves. The stairs cracked as they went up. Miku looked at the room, everything seemed comfortable. There was a huge window at the back from where you could see the vast forest and it had translucent curtains. Two aligned beds were placed facing the window. There was also a small table between the two beds. However the most important part was that the ceiling resembled that of an attic thus making the room quite small. Luka headed to the bookcase and examined it carefully while Miku just placed her suitcase on the scarlet carpet that lay on the floor. Luka grabbed a book and began reading.

"Luka-senpai…" Miku began.

"What do you want?"

"N… no nothing… sorry…" Miku looked away sad. There wasn't anything she could do with Luka even though she was with her.

-o-o-o-

The next day Luka woke up and went downstairs to check the mailbox. She opened it and took the letter out. She opened the seal and read it. Soon, she saw Miku coming closer. She had gone on a walk to the forest.

"Hatsune Miku, look," She declared as she showed the letter to Miku.

"Centipede?" Miku said confused after reading. The letter instructed them to possess the giant centipede in the swamp that was located nearby. Miku looked at it terrified.

"I hope you can work correctly," Luka commented as she went upstairs.

-o-o-o-

Miku followed Luka silently through the forest as she carried her violin. She looked around apprehensively. The truth was that she hated bugs. If she had to deal with a giant one she would probably feel nausea or faint. Luka would be disappointed, she would surely be, but what could Miku do in such a situation?

"It's here," Luka declared and stopped in front of the swamp. Then she took her flute out of its case and began playing it in front of the waters. Miku watched her scared for some seconds and then she took the violin in her trembling hands. Soon enough the centipede jumped out of the water and splashed Luka's clothes with mud. She didn't stop playing and nor did Miku. However her melody wasn't calm enough and the bug started attacking them quickly. Firstly, it tried to knock Luka off but she avoided it by jumping to one side. Miku backed off as fast as she could. Luka glared at her and played a magical melody that made a translucent shield appear in front of them. Of course, the centipede was strong so it went on the opposite direction and by avoiding the trees it ended up behind them, more accurately behind Miku.

"Stop!" Luka warned her and Miku looked back at her. The bug didn't really seem to be in a positive condition. Luka took Miku's hand and fled from the place as fast as she could. "We have to find a good plan," she said panting when they found a shelter.

"What kind of plan?" Miku asked.

"After examining its reactions I have come to the conclusion that we will need a harp, but not any harp. It has to be the legendary harp of the Mystical Sea…" Luka asserted.

"Wait… how did you know that?" Miku asked confused.

"Well, it's something in my area of expertise. The easiest way to lure bugs are harps and violins… but there are some bugs that need legendary instruments. This is because they are older than one century." Luka explained.

"Oh… so now we have to go to that Mystical Sea… right?" Miku asked a bit worried.

"Yes, we have to dive in the sea and retrieve the treasure. There is some kind of submerged labyrinth there. We have to be careful because you can get easily lost…" Luka looked at Miku with a serious expression.

"It sounds fine to me!" Miku replied trying to seem tough.