Originally a public transportation bus infused with Tran's Dimensional Bug, Bus Jigen uses his guise to take people and digest them one by one whenever in a dark place, leaving only foaming remnants of its prey. Kaori and Raita happen to be on the bus, believing that someone on the bus was killing. By the truth is after the driver, revealed to be a fugitive named Ota Kenchi, is digested. By then, the bus begins to assume its true giant form as the passengers escape. White Swan risks her life for Yellow Owl to get the others to run off before the others arrive in the Jet Machines. Forming Jet Icarus, the Jetmen battle Bus Jigen before using the Birdonic Saber to destroy it.