They arrived on Earth unannounced, calling themselves the original humans, and they certainly weren't there to be friendly to the locals. Tsuna, a completely normal teenage boy manages to get caught up in the middle of a worldwide war going on between two very similar species, both fighting for the right to control Earth. All x 27

Sawada Tsunayoshi grew up with the Varia and had long since gotten used to their bizarre ways,ever since he could remember he had known that they were dangerous people and wouldn't hesitate to take lives. He had also grown up learning that they would stop at nothing to protect their own family.

Tsuna just wanted to have a peaceful and normal day, one without fighting or mafia business. With his luck, this was impossible. Tsuna goes to stop a petty fight between two of his guardians and ends up being summoned to a parallel world by none other than... himself! Demon!AU

Growing up in the mafia couldn't be that bad, could it? Tsuna and Giotto, brothers who are complete opposites are forced to grow up on different sides of the mafia. Tsuna as a hitman and Giotto as part of Vongola. (Semi-au)