A/N : Now, the beginning of new arc! Hope you enjoy it!

Kayano's POV

It had been a few days since our date. Wait, I don't even know if it was a date or not. But, it was really embarrassing.

The day after that date, the students gathered around Nagisa and me. They asked if we were dating or not and such. But, when they asked that, I made excuses and immediately ran away. I haven't had a talk with Nagisa since that day because I tried to avoid him.

However, I thought the time had come.

The back of my neck became hotter as if the tentacles had almost reached the peak. I tried not to think about Nagisa again and focused on killing Koro-sensei. After the night came, I went to the school secretly and made a trap in the warehouse. It was the right time. I would attack and kill him tomorrow with my tentacles no matter what.

When I was thinking about that, I suddenly felt like almost couldn't control my mind. My body suddenly became hot either, and my mind was filled with hatred toward Koro-sensei, telling me that I had to kill him. It felt different from yesterday. I thought I could hold it longer... But it was impossible because actually I had this tentacles since half year ago.

I kneeled down, touching my own chest. My breathing had become irregular. I tried to catch my breath and calmed myself. But, my desire to kill Koro-sensei didn't disappear at all.

"... I-I have to kill him."

The next day, I invited Koro-sensei with me to go to the warehouse together. Koro-sensei, without suspicion at all, gladly followed me as he continued to ask me what I wanted to show him. Of course I just answered him with a fake smile and said it was a secret.

"Kayano-san. What are you going to show?", Koro-sensei asked curiously once again.

"Something really great," I replied again with a smile.

"Nurufufufu. I can't wait to see what it is!", Koro-sensei said with his usual big grin that was plastered on his face every time.

I kept walking toward the warehouse and closed the door. My back was facing Koro-sensei, so he didn't know that I was smirking.

Koro-sensei was still waiting for me to show that 'something really great'. But, his happy face immediately changed into surprised face when he saw tentacles went out of the back of my neck.

I covered my face with both of my hands, then slowly I glanced at Koro-sensei still with a smirk.

"I got you."

I started moving my tentacles and attacking Koro-sensei. The wooden floor was destroyed by my tentacles, sending Koro-sensei fly down into my trap.

But, before I could move into my trap to continue to attack Koro-sensei, I heard the door open and then I saw Nagisa look at me with wide eyes.

Seeing him like that, somehow I felt like my heart had stopped.

All of sudden, some thoughts immediately came to my mind.

What if he doesn't like me anymore when he knows the truth?

What if we can't be together again?

Will he leave me?

A lot of negative thoughts appeared in my head, making me almost forget about Koro-sensei who was in my trap.

'Right. When he knows the truth, it's the end for us. We can't be friends anymore. I have to forget him and kill Koro-sensei now.'

I looked away from him and then I went into my trap to attack Koro-sensei. However, I was late. Koro-sensei managed to go out of my trap. I clicked my tongue and glanced at Nagisa.

'It's because of him that I become like this. I'm not myself and I can't kill Koro-sensei!'

Thinking like that with anger, I destroyed the warehouse and flew up (with tentacles' help) to near the old school building, making all of Class E's students to notice me.

They quickly ran up to see me from the windows, looking at me like they didn't believe what they just saw.

"Is that... really Kayano?"

When I heard that, I turned my head to look at them. They gaped with surprised face.

Then, I looked away from them and decided to go away from there, but suddenly I heard Nagisa's shout.

"Kayano!"

I tensed up when I heard his voice and unconsciously my body stopped.

'... No, I can't! I have showed them my true self! I can't go back to them again...'

I turned around and faced the students. They were still looking at me, surprised, especially Nagisa.

I could see his face become pale, and as he walked slowly towards me, he asked, "Kayano... Tell me. Why do you have tentacles?"

I stayed silent for a moment and just stared at him with cold face. Then, I walked pass him and said to Koro-sensei who was still in confusion, with sweats running down his entire yellow face.

"I was careless at that time. Even though I want to give it all I had. Well, now, it's a failure."

Koro-sensei paused for like 10 seconds, then he slowly replied, "Kayano-san... What has happened to you?"

A smirk decorated on my face as I heard him call me that. "Kayano? Sorry, that's not my real name." I gave a pause, and then continued, "I'm Yukimura Aguri's younger sister. Get it yet, murderer?" I emphasized the murderer part.

I took my cellphone and told him that I would tell him the time and place to kill him tomorrow.

After I finished telling him that, as I was about to go from there, Nagisa shouted once again.

"Kayano!"

I tensed up a bit at that moment, but then I tried to ignore Nagisa's shout and quickly left without turning my head anymore.

'Why does my body always stop when he calls my name?', I wondered.

My body became even hotter and sweats kept running down my spine as I kept jumping with the help of my tentacles. I had a headache and I almost couldn't think about anything other than killing Koro-sensei.

'Kill. Kill. Kill'

It was as if the tentacles themselves told me that by trying to control my mind.

Various emotions jumbled in my mind. I didn't know which was my real mind, my real desire.

The word 'Kill' continued to repeat in my mind until I almost couldn't hold it anymore.

I felt like I wish tomorrow would come faster, so I could quickly Koro-sensei.

'Yeah. Kill him.'

As I said that in my mind, I didn't actually realize that I showed an evil smile on my face. But, I was in the middle of the mountain, so people rarely passed here. If someone passed by now, they would think I was crazy.

... I was almost 'crazy' though.

When I was back at home, I plopped down on my bed quickly after I entered my bedroom. I wanted to sleep early today so I could kill him tomorrow.

When I lied down on my bed, my head became less confused. And in the middle of my thought, reflections of Nagisa continued to be in my mind.

Nagisa was smiling at me while waving his hand, greeting, 'Good Morning' to me.

Nagisa was eating his pudding with me.

Nagisa said that he liked me.

However, the last reflection I saw was...

Nagisa looked at me with surprised face, as if looking at a stranger, just like when he saw me with tentacles today.

My heart hurt when I thought that, although my head became better. But, it was not that easy. As soon as I remembered about my sister, my mind was filled with 'kill' again.

Nagisa and my sister... Who is the more
precious one?

'Of course I know the answer... It's my sister. And, if Nagisa was my precious one, he didn't know the real me. Our relationship was all fake.'

Thinking about 'kill' and 'Nagisa' almost as if it could destroy my brain, so I immediately slept while clutched my blanket. As I was asleep, I didn't realize that a tear went out of my eye and streamed down to my pillow.

A/N : late update again, and how do you feel while reading this chapter?