Ever since Tsuna was born he was weak. His heart was weak and he was physically weak, therefore, it was very unlikely that his flames would ever appear. If they ever did, there was a chance that he would die straight away from the strain to his body and heart.

Tsuna's brother, Ieyatsu, on the other hand, was strong. It was obvious that when his flames finally appeared that they would be strong and fierce. He cared deeply for his brother as he knew that he was weak and couldn't do all of the things Ieyatsu did as it could hurt him if he did.

Iemitsu knew this and thusly he decided that Ieyatsu would be the candidate for Vongola Decimo, even though it was Tsuna birthright since he was the oldest. He also decided that, with his weak heart, Tsuna couldn't go on living in a family that was involved in the mafia, especially one that had the candidate for Vongola Decimo living in it. So, with a heavy heart, Iemitsu realised what he had to do.

Present day (6 yrs old)

"Yatsu, wait up."

"Hurry up, Tsuna, you're taking too long."

Tsuna and Ieyatsu were currently playing in the park together. Ieyatsu was constantly slowing down for his older brother so he could catch up. He didn't mind though.

*pant* *pant* "Yatsu, you know I'm not as fast as you," Tsuna complained.

"Yeah, I know. I'm sorry. Hey, do you wanna go play on the swings again!" Ieyatsu said excitedly.

"Sure!" Tsuna agreed with a quick nod.

With that, they both sped off towards the swings. Iemitsu was sitting on a bench, watching both boys play. Even though his mouth held a smile, his eyes showed sadness. Today was the day that he would do it. He knew that it was the right thing to do. He even told the Nono his plan and he agreed that it was for the greater good. Tsuna just looked too similar to Ieyatsu and assassins could mistake Tsuna for him and Tsuna would be too weak to defend himself.

Iemitsu took a deep breath and shuttered 'I have to do this. I know it's for the best, but...'

Iemitsu cut off as he watched his sons play with so much happiness, so much joy.

"Tsuna, I'm so sorry." Iemitsu whispered to himself before he stood up. "Tuna-fish, Yatsu, it's time to go home," he shouted.

They both looked up at the same time. Ieyatsu was currently swinging Tsuna.

"Aw, but Dad, it was almost Tsuna's turn to swing me," Ieyatsu said with a pout.

"Don't worry, Yatsu. I'll swing you extra long next time we come to the park," Tsuna said with a smile.

"Okay!" Ieyatsu said, copying Tsuna's smile.

Iemitsu felt a pang in his heart at that knowing that there wouldn't be a next time.

He pasted a fake grin on his face, "Come on. Let's go."

They began the walk home, but, a few blocks away from their house, Tsuna stopped, panting deeply.

"Ieyatsu, you go on ahead. I'll wait for Tsuna," Iemitsu said.

"Uh, okay."

Once Ieyatsu was out of ear range Iemitsu looked at Tsuna with deep sadness.

With fake happiness, Iemitsu said, "Hey, Tuna, do you want to climb on my back. We can take a little walk around. What 'dya say?

"Sure, but I really wish you would stop calling me that," Tsuna said.

Tsuna then climbed on Iemitsu's back and they proceeded to walk in the opposite direction to their house.

After a while, Tsuna began to fidget.

"What's wrong, Tuna-fish?"

"Nothing... it's just getting really dark."

"Don't worry we're almost there." Iemitsu said too quietly for Tsuna to hear.

They continued to walk for a while until they came to a stop. Tsuna lifted his head from Iemitsu's back where he had laid it because he was about to fall asleep. He looked at their destination in confusion. It was a dark alleyway.

Tsuna felt a shiver run down his spine. He had no idea where they where and they had been walking for around an hour. Why had his father brought him here?

"Uh, Dad. Where are we?" Tsuna said shivering slightly against the chill of the night.

"Tsuna, you...you're going to have to stay here."

Tsuna immediately knew that something was wrong as soon as his dad had said his real name.

"What? But...but I promised Yatsu that I would swing him extra long and I-I wanna go home," Tsuna cried out "This is just a joke, right Dad?" Tsuna tried to glance at his father's face but froze as he saw his serious expression.

Iemitsu's gaze hardened and he dropped Tsuna to the ground and growled, "Tsunayoshi, you are going to stay here and I never want to see you in my house ever again. Is that understood?"

But-but I don't..." Tsuna began.

However Iemitsu had already turned and begun to walk away.

Tsuna knew that if his father didn't stop now, then he would never see him again.

"Dad, wait. Please don't leave me here." Tsuna begged.

Iemitsu suddenly stopped and Tsuna thought for a second that he really was just joking and was about to turn around, pat him on the head and take him back home.

He was wrong.

"If anyone in my family ever sees you again, I'm going to make you wish that they hadn't."

Iemitsu hadn't turned to face Tsuna, but if he had, Tsuna would have seen tears streaming down his face.

Tsuna had a look of horror on his face after this. Iemitsu immediately began his fast pace again and Tsuna knew that it was pointless to beg so he just fell to the ground and began to cry.