KHR: Another parallel world?!

Prologue

From Author: This is my first cross-over! It's a KHR X BNHA!!!
This story will be hard to understand if you haven't seen any of these manga/anime (I will reference more to the manga).

Please enjoy!

"Speaking"
'thoughts'
"Italian"
*SOUND EFFECTS*

Disclamer: I don't own KHR or BNHA, but I own my creativity.

Ages:

Hibari, Mukuro: 26 (later on 18)

Ryohei: 25 (later on 17)

Tsuna, Gokudera, Yamamoto: 24 (later on 16)

Chrome: 23 (later on 15)

Lambo: 15 (later on 7)

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Sawada Tsunayoshi, the tenth Vongola boss, solemnly looked around the burning Vongola mansion. Bodies were littered around the burning room, all that Tsuna could smell was the metallic scent of blood and burning flesh,
"DIE VONGOLA!!!!!!!!" A man lunged towards Tsuna only to be killed quick and efficiently.

Tsuna looked down at his blood drenched hands and felt despair. He had promised he would not kill, however it was too late now, he had killed thousands of men that had tried to kill him and his friends. Tsuna had already lost his mother and father, who had been assassinated without Tsuna's knowledge, his friends had already died as time passed, only leaving an empty despairing sky.

Tsuna looked towards the gun the man he had just killed had been using and picked it up.
'I wonder if I am going to be forgiven by death...' Tsuna loaded the gun and placed it next to his head,
'I got nothing to lose anyway... I'm sorry Reborn.'

*BANG*

The gunshot rang throughout the dead silent mansion, and silence took over once again.

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Tsuna blinked his eyes as he woke up on a bed,
'...Didn't I die?' He stood up from the bed and observed the unknown room.
'Why is the room full of bright coloured posters?' The room was covered in posters of a bulky blond man (with two antenna?) wearing a blue and red tight-skin jump-suit that made Tsuna shudder at the appearance.

"Ah, you woke up." Tsuna faced the new voice, it was a boy about 16-years old. He had curly dark green hair that reminded Tsuna of his youngest guardian Lambo,
"How are you feeling?" He had freckles and wide eyes that Tsuna thought that it was similar to his.
"Um, are you listening?" Tsuna snapped out of his obsevation mode and looked at the boy.
"I'm-" Tsuna was surprised at his voice that seemed a bit pitcher than before and pat his body that also seemed to have shrunken smaller than his original body,
'...Have I shrunken?' Tsuna sighed at the sudden feeling of stress that took a full blow at him as he slumped down onto the floor.
"Eh! Are you feeling bad? Do you need water?" The boy panicked as he rubbed Tsuna's back and looked troubled,
"I'm fine but if you can, could I have some water and painkillers?" Tsuna rubbed his temples to relieve his headache although it didn't have much effect,
"Okay, painkillers." The boy was quick on his feet and immediately left to get the asked goods.

"Thanks." Tsuna sighed as the drug did it's magic and calmed him down,
"No problem!" The boy smiled at Tsuna cheerfully and figited slightly.
"I was shocked when I saw you drowning in the sea nearby our house." The boy scratched his cheek nervously and looked worriedly at the Vongola boss,
"I was drowning? Was it suicide?" Tsuna asked the boy who seemed troubled at his demands
"Don't you remember anything?" The boy questioned Tsuna who was tying to recall his memories.
"...I don't remember." Tsuna could feel the oncoming stress.  He knew nothing of this world. 
"I think we should go to the hospital." The young boy grabbed his jacket and helped Tsuna off the floor,
"We don't need to." Tsuna said as his intuition told him not to go to the hospital
"Eh? But-"
"I don't want to." Tsuna cut off the sentence and supressed an urge to sigh at the boy.
"...What's your name?" The boy asked the Decimo,
"...Tsuna, Sawada Tsunayoshi." Tsuna told him as he didn't feel any ill-intent from the boy
"I'm Izuku, Midoriya Izuku."

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From Author: I'm finished! I thought that Izuku was shorter than Tsuna, but it seems like Tsuna is 13cms shorter than Izuku -_-;

In ths story, Tsuna will be in hyper mode (boss mode) all the time and he is mature since he was 25.
Comments please~ =^_^=*