He healed her loneliness

Festival! He finds out

It was time to prepare for the school festival and everyone got in groups helping each other out and planning where things should go, meanwhile Yuki sat alone on the rooftop not participating. She closed her eyes taking a nap going into her dream world.
                ~Yuki's dream~
"Kazuo it's best if you didn't care so much about me." Yuki said in a serious tone of voice. "What do you mean Yuki? What are you trying to tell me?" Kazuo asked confused.
Yuki took off running away to go kill a girl and she did, Kazuo chased her and when he saw Yuki holding a knife he froze when he saw her covered in blood.

"Yuki what did you do?!" Kazuo asked looking frightened. "I told you, you shouldn't care or like someone like me. I did it because I love you!" Yuki said looking at him. "You killed those other students just like you did to this girl?! Why?!" Kazuo asked frightened and confused. "I already told you why, I love you Kazuo. You made me feel special and crazy about you, I had to kill them so we could be together. You don't need any of them as your friends, only me!" Yuki said walking closer to him.
                      ~~~~~~~
Yuki woke up and looked down at the people who were still busy working on the festival stuff, she put on a cape covering her face with it as she stood up crying and stood on the railing balancing.

( I love him, I love him very much! my dear Kazuo, I love you! I want you to fill in the emptiness in my heart but I know you won't like me after you find out the truth of who I really am, it's best if I eliminate myself too.)

"Someone is about to fall off the roof!" A student shouted getting everyone's attention.
Yuki prepared herself in her bloody uniform from killing a student and she wore it under her long cape. Everyone looked up at her all worried and frightened, Kazuo noticed that it was Yuki so he quickly ran back in the building to the roof.

( He's coming, he shouldn't! He shouldn't stop me!! I'm already up here afraid but I'm going to do it!)

"Yuki stop!" Kazuo shouted from the doorways. "I'm going to do it!" Yuki yelled back. "No your not! Why are doing this?!" Kazuo asked confused. "You won't like who I am, you'll be like them calling me names!" Yuki yelled while looking down. "No I won't be like them I promise Yuki, come down don't do it." Kazuo said calmly. "Do you promise?" Yuki asked making sure. "Yes I promise!" Kazuo said walking towards me.
"K-Kazuo I can't get down." Yuki said with fear in her voice. "Yes you can, why can't you?" Kazuo asked confused. "I just can't!" Yuki cried. "Okay I'll help you, just move your foot this way." Kazuo said guiding her.

Yuki slowly crossed her left foot over her right like a type rope walker and slowly tried to turn, loosing her balance she missed the railing falling but she grabbed the railing and it freaked out Kazuo.

"Yuki!" Kazuo shouted getting closer holding his hand out. "Kazuo!!" Yuki yelled crying.

He pulled her up over the railing as everyone watched they all felt relieved as they saw him pull her over the railing.
"Why were you up there on the first place?! What were you thinking Yuki!" Kazuo angrily asked. "I'll tell you but not here." Yuki said calmly.

She took him to the gym so they were alone and so she could run away home faster.
"Are you going to tell me?" Kazuo asked confused. "I'm going to show you and tell you, go ahead and run after you find out." Yuki said turning her back towards him. "Why would I do that?" Kazuo asked confused. "Kazuo, I know how the girls died." Yuki said clenching her fists. "You do? How did they die?!" Kazuo asked waiting to know.

She took off her cape turning around showing him her bloody uniform.

"I killed them. Just for you Kazuo." Yuki said calmly. "For me? What?! You killed them?!" Kazuo said confused while freaking out. "Yes I did it for you! I love you Kazuo! now that I told you, you could never love me!!" Yuki yelled. "How could you do that?!" Kazuo asked freaking out. "I wanted you all to myself, go ahead and run away now." Yuki said while putting her cape back on.
She began to walk away exiting when he stopped her.

"Wait where are you going?!" Kazuo asked wondering. "Away, I have to stay away. Goodbye Kazuo." Yuki said before leaving.
Kazuo ran after her but when he got outside he didn't see her anywhere.