Sawada Tsunayoshi's parents had been killed just when he is still 5 years old. The Estraneo Famiglia had found him, and subjected him to experiments. Since then, he lived as an experiment - as their guinea pig. That is until the World's Greatest Hitman saved him from their clutches. From then, he (almost reluctantly) took him home. A family-less child and the World's Greatest Hitman; what will happen to them now that both of them is going to be under the same roof. [Parent!Adult!Reborn and Child!Tsuna; No Pairings]
1 part