Tsuna, Sawada Tsunayoshi was a shy boy who live with his mother, Sawada Nana. His twin, Sawada Nayoshi was a skillful boy (and also a brat.) Nayoshi was very overprotective to his brother... but... After an accident, he lost all of his memories about his brother. Nayoshi started to become greedy. But why? Their mother started ignoring Tsuna also. But why? Tsuna ran away. And there, he met his new family that he will be part of. One Sky. Another Sky. And Another Sky. Vongola Sky Ring. Mare Sky Ring. Sky Arcobaleno. Who are they? And the finale... The... Who is it?