The day when a twin of Miyoshi and Tsunayoshi being born, was a day which everyone on Vongola famiglia waited for.
Vongola mansion is no longer silent since they come to.. everyone love them.
But one day, Tsunayoshi and Nagi being kidnapped by Vongola enemy, Byakuran.
Tsunayoshi keeps on resisting from obeying Byakuran when he experimenting him but Byakuran have another plan. He control Tsunayoshi. To release Tsunayoshi, Nagi attempt to follow Byakuran orders too.
will they be free? what will the other do to help them?
1st generation as parents and 10th generation as child.