[Crossover] He Has a Secret

Obito Uchiha has a secret. In another world, he has a name too: Obito Sawada. Tsuna Sawada has a secret. In another world, he has a name too: Tsuna Kudo. Shinichi Kudo has a secret. In another world, he has a name too: Shinichi Saiki. And his classmate Kaito Kuroba looks exactly like him. Kusuo Saiki has a... well, he came right out and told his family, so it only counts as half a secret. In another world, he has a name too: Kusuo Kuroko. Tetsuya Kuroko has a secret. In another world, he has a name too: Tetsuya Atobe. Keigo Atobe has a secret too. In another world, he has a name too: Keigo Uchiha. On the surface, the relationships are as follows: Obito is Tsuna's younger brother (Obito's body in Tsuna's world has shrunk to that of a five-year-old), Tsuna is Shinichi's younger brother, Shinichi is Kusuo's cousin, Kusuo is Tetsuya's cousin, Tetsuya is Keigo's older brother, and Keigo is Obito's cousin. What a terrifying loop. When do you think they'll realize that everyone around them has a secret?