Boomerang Trap is the 112th episode of the Katekyo Hitman Reborn! anime.
Yamamoto ends up in a room full of pipes. There he meets a White-Spell Millefiore member who uses a boomerang with the Storm Flame to attack him. Yamamoto realizes that he could not predict where the attacks are coming from because he was actually fighting twins, the Arachide Brothers. Yamamoto finds a way to defeat them. Later, Shoichi Irie moves the base again, and Gokudera and Ryohei run into Gamma.