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Box Weapon Prototype

146 Cover

Bokkusu Heiki Purototaipu
Air Date August 15, 2009
Arc Arcobaleno Trials Arc
Episode 146
Opening Song Easy Go
Ending Song Aoi Yume
Episode Guide
Guardian Showdown Cloud vs. Mist
Catch the Wind

Box Weapon Prototype (匣兵器プロトタイプ) is the 146th episode of the Katekyō Hitman Reborn! anime series.


Tsuna, Yamamoto, and Ryohei are called out to Namimori Middle School, where they encounter Mammon, who reveals he has Kyoko hostage. Mammon begins Tsuna's trial with a set of riddles which leads them to various locations. The final riddle leads them to Namimori Shrine, where he reveals he does not actually have Kyoko hostage. Mammon uses a box weapon and releases a starfish to battle the three, but is quickly defeated. Tsuna passes Mammon's trial of adaptability and receives the seal. Reborn asks Mammon about his Box Weapons; the latter replies that the boxes have been showing up in the mafia and that the Lightning Arcobaleno Verde has asked him to test them out.


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