Hey there everyone!

here with a new crossover fic between a well known anime and manga known as Katekyo Hitman Reborn and a Malaysian 3D animated series known as BoBoiBoy.

For those who doesn't know anything about either one, you can look up to it on Wikipedia. BoBoiBoy wiki is not recommended to check up on though, because they sometimes put unnecessary stuff and they had really bad English writing skills. Read the Reborn manga and you could check out the English Dub of the first season of BoBoiBoy on Youtube, posted up by the animators themselves, Animonsta Studios.

I know there are some stuffs that you will read that doesn't make any sense but I'm really trying to get the story to flow so forgive me. Plus this is my first crossover fic.

One more thing is that if this fic is way too similar to some other fanfic in terms of intro plot or something, sorry cause I didn't do my research. Plus, I may get a few things wrong about some plotlines in KHR. I didn't read those in a long time. Takes place after KHR manga ended and prior to the beginning of BoBoiBoy season 1.

Disclaimer: I do not own Katekyo Hitman Reborn nor do I own BoBoiBoy. They belong to their respective owners. I only own some Reborn anime DVDs, a few copies of the manga, nearly a set of the BoBoiBoy figurines and the fan arts that I drawn.

On with the story!

Chapter 1: Adopted

It was another normal 'dame' day at school for a certain 15-year-old brunette named Sawada Tsunayoshi or 'Dame-Tsuna' to his schoolmates or Tsuna to some of his friends. However, unlike other days, Tsuna had to rush home, thanks to a certain event earlier that morning.

*Flashback*

"Dame-Tsuna!" Tsuna who was approaching the door stopped his step when he heard a high pitched voice before turning his head around, revealing an infant with a rather large head wearing a black suit and a fedora with a green chameleon sitting on the fedora standing on his two legs right behind him.

"Re-Re-Reborn?" Tsuna said nervously at the baby that he called Reborn. The infant stared at Tsuna's eyes, as if staring right into Tsuna's very soul. Having knowing Reborn for a long time, Tsuna knew that Reborn would think of some way to make his life miserable.

"I expect you to come home early after school" Reborn said in a serious tone as he turned and left. That made Tsuna even more nervous. He knew the consequences of not listening to Reborn's words as well as fulfilling them. The tone Reborn went into made it worse for Tsuna. Knowing him, Tsuna could guess Reborn would prepare Tsuna for some kind of torture or 'training' as he claimed. After all, the infant was Home Tutor Hitman Reborn.

*Flashback end*

At this very moment Tsuna was standing right in front of the front door of his house with his mind filled with thoughts of what Reborn would planned for him. The baby hitman would be planning anything that was anything but good news for Tsuna. Now, some of you might wonder, why did Tsuna ended up with someone like Reborn?

Well, a normal person might look at Dame-Tsuna as a middle school student who fails at almost everything except being 'dame'. But truth to be told, Tsuna is actually next in line to be the tenth boss of one of the strongest Mafia family- if not the strongest, the Vongola Famiglia. Reborn was appointed by the Ninth to train Tsuna so that the brunette would take over the family as its boss. Even though Tsuna refused to be part of the Mafia but he still ended up being 'trained' by Reborn. Ever since Reborn came to Tsuna's life however, Tsuna eventually gained friends of his own and Tsuna grew from a hopeless teen to a leader with the resolve to protect those he cherished. Despite those changes in life, Tsuna still refused his heritage and to this day he was stuck with Reborn to not be trained to be Vongola Decimo but Neo Vongola Primo. But let's go back to the main story, shall we?

"I'm home!" Tsuna greeted as he entered his house and removed his shoes. That was when he noticed something standing on top of a flight of stairs right in front of him. It was none other than Reborn.

"Yo, Tsuna!", Reborn greeted in a happy tone. Tsuna became nervous when he saw that smile. That smile meant anything but pleasant and anything else positive to Tsuna.

"U-um, why did you make me come back home early Reborn?" asked Tsuna even though he knew the answers obvious. Whatever the answer, it would just meant torture for the brunette.

"Baka! Of course we're training! Get your lazy ass up here!" Reborn said. Knowing Reborn and his death threats, Tsuna rushed upstairs and ran past Reborn into his own room. Once Tsuna was in his own room, he heard the door close.

"For training today, I want to you to fight Hibari", Reborn said almost immediately after Tsuna turned his head at the infant.

"What!?" Tsuna said immediately after Reborn's sentence.

"You heard me. Now put your stuff in this plastic bag, and when I said stuff I meant you Vongola Gear and any battle equipment" Reborn said as he pulled out a green plastic bag out of nowhere.

"Where did you get that from?" Tsuna asked nervously, only to have Reborn pointing a green pistol at Tsuna's forehead. Tsuna then shrieked and instantly remove his equipment such as his gloves, pills, contact lenses and his Vongola Box Ring before putting them into the plastic bag in Reborn's hands.

Then all of a sudden, the door quickly opened and a child wearing a cow suit and a big hair that covered nearly his whole head save for his face ran into the room!

"Gyahahahaha!" the child known as Lambo laughed.

"Lambo!?" Tsuna shouted. He saw Lambo holding a blue spherical object in his hand.

"Take this!" Lambo happily shouted as he threw the sphere at Tsuna.

"HIEEEEEEE!" was Tsuna's last words before blue smoke filled the whole room almost in a second. A few seconds later, the smoke cleared. Everything was strange…. Save for the fact Tsuna completely disappeared.

"Eh? He's gone" Lambo said as he looked around the room. But he gave up looking and went out of the room for snacks instead. Reborn, standing on Tsuna's bed, looked down on the carpet where Tsuna was last seen with a serious face.

"Looks like I have to talk to Gianinni about this" Reborn said.

So... what do you think?

Leave some reviews and tell me your opinion, cause I really need it to improve my writing skills. Next chapter's the part where the crossover's happening.

Till the next chapter, bye!