Simultaneous Transmigration: Starting from the Uchiha Clan Massacre

Mu Feng opened his eyes and found himself transmigrated as the twin brother of Uchiha Sasuke. Good news: he has a cheat ability shared with other transmigrators. Bad news: the cheat only activates after the clan massacre. The unconscious Uchiha Mu Feng arrives in a meeting room, where each chair represents a Mu Feng from a different world. They can share powers and memories in this space. The meeting room is just starting out, with only Mu Fengs from the worlds of Naruto, Demon Slayer, and JoJo. Mu Feng from Demon Slayer: His family was killed by demons, and he was taken as a disciple by Sakonji Urokodaki. He is about to participate in the Final Selection with Sabito, Giyu Tomioka, and Makomo. With only a basic grasp of Water Breathing, can he survive against the Hand Demon? Mu Feng from JoJo: He lives in Morioh Town. Can he protect his family? Mu Feng from One Piece: An ordinary person forced to participate in the Summit War...