The next day, we were all training with Karasuma-sensei during gym class. As I waited for my turn, I sighed. "Lovro-san and Irina-sensei are really riled up, aren't they Karasuma-sensei?" I said. "...Yes. They're getting annoying." he grumbled. Irina-sensei and Lovro-san were in the trees, waiting for gym class to end. Evil grins were on their faces as they thought of their plans.

After class ended, Irina-sensei came up with a drink. "Karasuma-sensei! You must be thirsty, right? Here, drink up!" she said with her baby voice. In the end, Karasuma-sensei rejected her and walked away. During lunch, Lovro-san seemed to try to hit Karasuma-sensei, but in the end, he was injured. Worried about his state, I went inside the faculty when Karasuma-sensei left, and saw that Lovro-san's hand was in bad shape.

"Lovro-san, please come with me. I'll take care of your hand." I said, and he obliged. Taking him to our small medical room, I made sure that no one was around or nearby before healing his hand. "You..." he trailed off, surprised. "Please do not tell anyone about this, I want this as a secret." I said, and he nodded. "I see. And when do you plan to reveal this to your classmates?" he asked. "When the time is right."

Grabbing some gauze, I wrapped his hand up. "Even though it's healed, I'll wrap this up so that no one gets suspicious." I told him. Tying it up, we left the room and I went back to lunch. Seeing how everyone was at the window, I went over to see that Irina-sensei was making her attack on Karasuma-sensei. In the end, she won by using a trap and with Karasuma-sensei giving up.

A few days later, it was a rainy morning as we went to class. "Karasuma-sensei has told you that there's a new transfer student coming in, correct?" Korosensei asked, and I remembered the information Karasuma-sensei emailed to us. "Ritsu, do you know anything about them?" Hara asked. "Yes, a little. Him and I were supposed to be together, with his close range and my long range, we would corner Korosensei. However, that was delayed for two reasons. One was because his "adjustments took longer than expected. The second is because I was overwhelmingly inferior compared to him." Ritsu explained.

Just then, the door opened, and in stepped a man dressed in white. "Sorry, I must have frightened you. I am not the transfer student, I'm merely his guardian. Please call me, "Shiro"." Shiro gave Korosensei a present of yokan, as he looked at the class. When he spotted me, he seemed to give me an odd look before going back to Korosensei. "Because there he is quite... different, I shall introduce him, if I may." Facing the wall, he called out.

"Hey Itona, come in!"

I froze.

'Itona... Itona... No, it can't be-?!'

But it was.

Someone crashed in from the wall and sat at an empty desk next to Ritsu and I, giving me a nice view. He had silvery, spiky hair, and odd yellow eyes. 'Like mine...' "This is Horibe Itona. Please call him by his name. I've spoiled him a bit, so please let me watch over him for the time being." Shiro explained. He looked at me. "You there girl, what's your name?" Shiro asked, and I pointed at myself as if to say, 'Me?'

"Yes, you." he confirmed. "I'm Erina." I said. "Erina, I think that you'll get along with Itona quite well, won't you?" he said in a teasing tone, and I glared at him. Itona stood from his seat and walked over to me. "You seemed to be the strongest in this class, correct?" I nodded slowly. "You're weaker than me. I won't kill you." he walked over to Korosensei. "You are stronger than me. I can't wait to kill you, brother."

Everyone yelled in shock as I simply stared at my desk.

'Itona... What happened to you?'

It was after school, and we had made a ring with our desks, us standing at the sides. Shiro had made the rule that if they stepped out of the ring, they'd be out. "Go!" Shiro yelled. In a flash, Itona had cut off Korosensei's hand. However, that wasn't we were staring at.

It was the tentacles from his head.

I stumbled, taking a step back. The battle raged on, with Shiro freezing Korosensei with a light every once in a while. In the end, Korosensei had won by trapping Itona with his molting and threw him into the window. Itona had gotten mad that he had lost, and was about to charge in when Shiro tranquilized him. Taking him away, the battle ended and we moved our desks back. I stood there, frozen as I hugged myself, breathing heavilyy. Irina-sensei came over and tapped me on the shoulder. "Erina, are you alright?" She asked in a caring tone, and I gave her a shaky smile. "Yes. I'm fine." I said before moving my desk. Everyone was talking about the battle, but I merely just stared at my desk.

Korosensei noticed my behaviour and called to me. "Erina?" I snapped. "Yes?" I called out. "Are you okay? You seemed off every since Itona came in." he noted. "Oh, it's nothing." I shrugged it off. "Erina." I looked over to Karasuma-sensei. "Even if you don't want to, it's best if you tell us." "Un. We'll be here for you." Irina-sensei added. "I might as well." Everyone turned to look at me. "Itona..." I hesitated.

"Itona Horibe is my twin brother."

Everyone was shocked.

"So that means..." "Yes. My full name is Erina Horibe. When we were 7, on our birthday, we were separated. I remembered it, but it seems like they put him on betablockers* to remove the memory. We have the same eyes and hair." I explained, and when they took a closer look, they saw it.

"Now that I think of it, you two do look quite familiar." Karma commented. "It must have been hard for you, seeing your brother after 9 years to find out that he's become such a monster." Maehara said, and everyone nodded. "Honestly, I don't feel that way. I'm just glad to see him again." Everyone looked at me, confused. "What do you mean?" they asked.

"I thought he was dead."

Looks of pity were directed at me, but I simply smiled as I looked at the desk. "But, I'm glad that he's alive. Though I'm not sure what "Shiro" did to him. Probably an implant..." I mumbled the last part.

It was after school, and we all decided on one thing. Going over to Karasuma-sensei, who was directing some people building some equipment. "Karasuma-sensei!" I yelled. Everyone appointed me as leader. Karasuma-sensei turned around and saw our large group. "What's the matter?" he asked. "We would like you to teach us more assassination techniques!" I yelled. He looked confused. "More than what you already know?" he asked, and I nodded.

"After watching Itona, we realized that eventually, Korosensei will be killed, and that we want it by our hands. In the future, If we are beaten by one punch, we won't understand why we've been trying so hard. That's why we want to kill him in the small amount of time we have." I explained.

"...Alright. In that case, I'll hold supplementary training after school for those interested. It'll be harsher than usual though." he explained. "Right!" we yelled. Leading us to a tree, he pointed at the ropes. "Well then, without delay, you'll be climbing these 20 meter ropes we just set up." Karasuma-sensei said with a evil grin.

And so, our extra training started.

* Betablockers - a type of medicine from the game To the Moon. Normally for heart conditions, a side effect is memory loss. If taken in a largish dose on a healthy person, it will only remove the memories, which is why it is possible that Itona could have taken them.