Disclaimer: I own nothing except for the idea of this story and a sheer amount of boredom.

There was so much blood; never had he seen so much blood in his life. Takenaga woke up at home in bed and when he removed his blankets his clothes were covered in blood. Panic took over him as he heard his friends talking outside his room.

"I'm really worried about him," Yuki said. "Sunako said he's refusing to eat and he's becoming more aggressive."

"I told him this project was a bad idea," Kyohei said. "Now we all have to suffer through it. I'm worried about him too."

"Maybe we should see if his teacher knows of a cure," Ranmaru suggested.

"Takenaga said there wasn't," Yuki protested.

"So? He's brilliant, not all-knowing. He could have missed something."

"It doesn't matter right now," Kyohei stated. "We have to go talk to him and convince him to eat something. Maybe the fact that he isn't eating is causing these headaches."

Takenaga panicked and replaced his covers, turning over, and pretending to still be asleep. They guys came into his room and saw him passed out.

"Either he's freaking out, getting a headache, not eating, or sleeping," Kyohei muttered.

"I can't wait until this stuff wears off this weekend," Ranmaru said. "Maybe he'll start acting like his old self again."

They left the room and Takenaga got up. He got a new pair of clothes and made a break for the bathroom to clean himself off. This is so not good, he thought to himself. How did this even happen? I barely remember anything over the last few hours…just like last time. Except this time I'm covered in blood. He was shaking when he then heard that voice again.

It's okay, Takenaga. It's just a little blood. The voice sounded somewhat pleased.

Not you again, Takenaga thought (he didn't want to say anything out loud or his friends would definitely think he lost it).

Oh come on, don't be like that. Remember, I'm your friend.

No you aren't. You're that murderer, aren't you?

Wow, you are a smart one. Why yes, I am the murderer. Well, sort of. You see, I'm inside of your body so technically, you're the murderer. The voice laughed in amusement.

NO! Takenaga defended. I would NEVER do something like that to anyone! Answer my question from before! WHO THE HELL ARE YOU?

Kana.

This couldn't be happening; it just wasn't possible. Takenaga's harmless experiment was actually affecting him. There was another person inside his head committing murders. Putting his hand to his head and just thinking of how impossible it was, the person he had been tutoring a few days earlier came over to him.

"Takenaga, I just wanted to thank you for helping me study the other day. I did really well on the exam."

Takenaga nervously looked over to him and faked a smile. "Not a problem. I was happy to help."

"Takenaga, are you okay? You don't look so good."

Takenaga looked away and waved goodbye as he called out, "I'm fine. You don't have to worry about me."

Takenaga knew that wasn't true but he had to do something. I have to go speak to my teacher. He said my experiment looked harmless enough. Maybe we both made a mistake.

I don't think you made a mistake, Kana said slyly, chuckling slightly.

Just shut up… Takenaga thought to the other person inside of him. This is just temporary and by the end of the week you will just be a terrible nightmare and I can get back to my life.

Somehow, I highly doubt that.

"Ah, Takenaga, how are you this morning?" his teacher asked him.

"I'm not going to lie, I'm feeling terrible. I mixed the pills you said would be safe to use, but I think something went wrong."

"What do you mean?"

"Well, I get terrible headaches; I never want to eat; I snap at everyone and have become too violent for my taste; and now I feel like there's someone talking to me."

"Oh my God…Takenaga, which chemicals did you mix with the pills?"

"Just the ones you circled," Takenaga looked at his teacher confused.

"Are you sure you didn't add the one I circled in red?"

"No, I didn't. I was very careful."

"Takenaga, I want you to order these medications now and bring them to me. Also, keep a journal of everything you're experiencing."

"Please, you need to tell me what's wrong with me. You obviously know. What happened?" Takenaga was starting to get very upset and was acting more like Yuki right now, on the verge of tears.

"If the drug I circled in red was mixed with those other pills, it would take being bipolar to an entirely different level," his professor began to explain. "Instead of having normal mood swings, you would instead have two personalities, DID, dissociative identity disorder. I don't know how long the effects would last, but someone used that medication in an experiment before. That's why I said not to use it. His other personality became a serial killer."

At this, Takenaga's heart sank. All of his fears had been confirmed. There really was another person inside of him and so far he had committed two murders that Takenaga actually knew of.

What am I going to do? I can't live like this…I just can't.

"Takenaga?" he heard a gentle voice call for him. He had gone up to the roof after he spoke with his science teacher. For the first time in his life, Takenaga had no desire to go to class.

He jumped at the sound of hearing Noi's voice. How am I ever going to tell her? I can't keep this from her.

"I heard from the guys that you haven't been feeling well. I didn't think this experiment would take such a heavy toll on you." She was about to put her hand on his shoulder when he backed away from her.

"I'm sorry Noi, I'm so sorry," he sat down and took his knees in his arms and started crying on his lap. "You can't come near me. I have no control over what I might do anymore."

"What do you mean?" she asked in an even softer and gentler voice. She put her hand to his face and got him to look at her. He was in shock at how much better he felt with Noi being there for him. She really was the best thing in his life.

Takenaga stared into her eyes and felt like they were the only ones up there, despite his other personality. He then started to get a headache again. He shot up, ready to run away before anything happened to her.

"T-T-T-Takenaga? What's wrong?" Noi asked, concerned for his safety.

"Noi, I have to go. Don't follow me. I'm sorry. I love you." Takenaga didn't even realize that he had just confessed his feelings to her; he was too panicked. He ran through the school to the exit with students looking at him and teachers chasing after him. He didn't care. All he knew was that he had to get out of there before Kana took over again.

Takenaga made it back home and ran upstairs to his room. He took out a notebook and began to write a journal about everything that had happened to him so that in case Kana took over, his friends would know. He went online and ordered the medications his teacher told him to get since he still had money left over from what his father gave him. Oh God, my father. If he ever found out he would probably yank me out of school forever. What am I going to do? I have to tell someone about this now before I completely lose my mind.

Takenaga hid the journal in his desk. Since he hadn't heard Kana's voice in a while, he was praying that he was asleep or whatever another personality does. He looked at his desk, at all of the chemicals he had bought. Something didn't feel right about how his desk was set up. Oh my God!

Takenaga finally realized what happened. "No, no, no…who was in my room?" He realized that the test tube that contained the unstable chemical was missing. Now he had to find out what happened.

"You got in a lot of trouble today," Takenaga jumped at the sound of someone else's voice. He realized it was Kyohei and not Kana.

"What are you talking about?" Takenaga really had no idea what Kyohei was talking about.

"You made such a huge scene today. Teachers were chasing you down the hallway and trying to prevent you from skipping school."

"I…I couldn't help it. I had to get out of there before something bad happened."

Kyohei was now even more concerned than he was the day prior. "Takenaga, what on earth are you talking about?"

Well Takenaga, you wanted someone to talk to…why not Kyohei? Oh God, now I'm talking to myself. "I really am going crazy."

"What?" Kyohei asked, stunned. Takenaga jumped; he didn't realize that he had said the last part out loud.

...

"Kyohei? Kyohei, please say something," Takenaga said after he was finished telling Kyohei everything.

"I told you that this experiment was dangerous! You should have talked to us before you drank that stuff so that we could have prevented you by force if we had to!"

"I know," Takenaga started crying again, "I know…"

Kyohei felt guilty. "Okay, I'm sorry; I didn't mean to yell at you. You don't need that right now." Kyohei scratched his head. "We should just figure out what happened."

"Did you come into my room at all, other than to 'give' me back my book?" Takenaga smiled, remembering getting hit in the head with the book.

Kyohei chuckled. "Thankfully, no. I would hate to be responsible for this."

"Hey you guys, we're home," Yuki called out.

"Takenaga, I think we should tell them. And you have your date with Noi tonight, right? You should tell her too, but we'll keep it from your parents and everyone else, okay?"

"Kyohei," Takenaga started, "thank you."