The Beginning of the Seven Seas

In the 2016 years, the Corner Digital World has been destroyed by the the Five Dark Kings. DexDorugoramon narrates about his origin.

• DexDorugoramon: The Corner Digital World was been shattered, by the Five Dark Kings. Oh, my name? Yes That's me. I'm DexDorugoramon, the Mega form of Dorumon; made from the extinct Dexmon's data. I'm formerly working on four remaining Dark Kings before I took the extinct Ornismon and AncientGarurumon's data.

DexDorugoramon managing to take the sample two extinct Digimons' datas before Megidramon X saw him as he betrayed them.

• Megidramon X: Hey, don't take that sample!
• DexDorugoramon: Sorry, the extinct Digimons will be live forever Megidramon. This Digital World wasn't yours, this is our world.

DexDorugoramon escapes from the four remaining Dark Kings. He lands on the unnamed island for his safety to keep out the four Dark Kings. As he landed the unnamed island, he de-digivolved into Dorumon, the Rookie form of the former Dark King DexDorugoramon.

• Dorumon: I'm must find away to stop this madness.

In the Human World, DexDorugoramon narrates and explanation about Human Worlds.

• DexDorugoramon: Meanwhile, this world was full of living creatures called humans. Well, just animals and plants were all living things, but some people lives and marriage. When they too old, like us, they will die. However, the newborn child will be their new age. This is Daiki Yuto, he's is the young human who searching the endangered and rare insect species.