After defeating Birds, Bianchi noticed someone in the shadows and told them to reveal themselves. The person revealed himself to be Futa who (with a distressed voice) told Tsuna that he was staying with Mukuro Rokudo and ran into the forest. Tsuna chased him into the forest, but the others were stopped by a flying girder that blocked their path. The girder was shown to be thrown by a tall man carrying a huge ball and chain with his face covered.
The man with the ball and chain revealed himself to be the Mukuro from the photo but claimed to be unaware of anyone named Fuuta. With great strength, he began swinging the massive ball and chain through the air causing Gokudera to collapse, due to fear of being hit and the side effect of Shamal's treatment. Yamamoto then stood up to fight but when Mukuro used a palm thrust to hurl the ball towards him Yamamoto found it impossible to avoid and was sent flying. However he stood up again as he had used his bat as a shield. Mukuro then used the same attack as before but Yamamoto threw up a cloud of dust allowing him to see the air currents and avoid the attack. Reborn deduced that the air currents were the result of the snake shaped groves in the ball that create a violent turbulence. Mukuro remained calm and this time threw the ball high in the air before thrusting it forwards with both hands and adding spin. As a result Yamamoto was dragged into the current and knocked unconscious by the ball. Bianchi then stepped forwards with poison cooking at the ready; however Mukuro claimed to have used less than thirty percent of his power.
Afterwards, Tsuna finds them and prepares to fight with the fake Mukuro.