When Reborn arrives to train Sawada Ienari as the Vongola Decimo, he is closely followed by Sawa Tsunayoshi, a mysterious boy who seems to have a lot of secrets. What is the transfer student from Italy hiding? And what will Reborn do when he finds out? Twin fic, parent Reborn, sky arcobaleno Tsuna, ill/abandoned Tsuna. (cover image and characters do not belong to me)