Picklemon ate Gammamon's champion/chocolates causing a ruckus in Kiyoshiro's room. He turns in time to see a bit bomb about to go off. Luckily, he reacted by using his digivice and entering the Digital World. Unfortunately, the bomb went off, and Kiyoshiro has a near death experience!
Jellymon blasts her darling awake. After the event, Kiyoshiro keeps hearing a voice in his head. Not only that, but he is barely avoiding dangerous events that could cause his death!
When a truck attempts to run down Kiyoshiro, he hits his head trying to evade it. This accident brings him back to the world between life and death. There he meets a Digimon that can only make friends with the dead.
Kiyoshiro is able to get in touch with Hiro using his celphone.
Mummymon puts Jellymon in a state between life and death. Once there, she evolves to Teslajellymon and rescues Kiyoshiro.
Turns out that the digimon, Sepikmon, had been the one calling for Kiyoshiro. He wanted to drag him back into the netherworld so they could become friends.