After travelling through many fields, the DigiDestined finally come upon a forest. However, they find that the forest itself makes up a Digimon’s body. Kari and the DigiDestined help this Digimon fight an old nemesis.
As their journey towards FAGA continues, the DigiDestined soon find a forest to relax in, only to discover it to be the back of a huge Petaldramon. Upon further exploration, they find some of the forest on Petaldramon's back having been damaged, and then are attacked by black bugs that they manage to scare off for the moment before Petaldramon starts moving. Palmon and Gatomon recognize the Petaldramon as being a legendary Digimon. Upon encountering a Muchomon and two Puwamon that were studying them, the Digimon explain that their home was destroyed by the black bugs and Petaldramon has been pursuing them for some time seeking vengeance for what they've done. Hikari asks if she can help, and Petaldramon accepts, showing its gratitude with providing medicine and food to the DigiDestined.
The black bugs soon return, and the DigiDestined move to protect Petaldramon, only for their leader to be revealed as Entmon, who isolates Petaldramon from the DigiDestined, unaware that Hikari and Gatomon are still on him with Komondomon. Petaldramon gets them to safety before going on the offensive, but despite its best efforts, it is soon bested and skewered by Entmon. Hikari tries to defend it, and her grief causes Gatomon to digivolve to Angewomon, who uses her power to aid Petaldramon, who heroically sacrifices itself to destroy Entmon, trapping both of them in new plant growth that would become a new forest for the Digimon it had protected.
(Numbers indicate order of appearance. Bolded characters are fought by the protagonist(s), and italicized characters feature non-explicitly, e.g. voice, silhouette, image.)