The last days have been very relaxing for you and your friends, so you all decide to cool off by the sea. Rumors say that the whole area is a temporary home of hundreds of Poyomons who came during their migration towards the Net Ocean. Although the situation along the beach is all right, thanks to your previous experience with these Digimon you know that they can get very mischievous at times.
Carrying a huge sun-umbrella for everybody, you finally get to wet your feet in the cool waves, you enjoy the view, determined not to let anybody disturb your peace. The only problem is that the muffled far-away sounds that come from the Poyomons get louder and louder, eventually forcing you to put on earphones.
Dozing off in the shade, you're startled by your team mates who are all gathered around you, looking fairly worried. Asking what's wrong, they tell you that the Poyomon got indeed louder, and it sounds like something might be wrong. Before finishing the sentence, a white mass is nearing hurryingly towards your location, and by the looks of it, apparently the whole colony is on the move!
Bracing yourselves for the wave, you notice that they are actually running away from something: a powerful Digimon flying by the sheer power of its strength! It's all clear, you need to stop that Digimon from harming these innocent white marshmallows. Powering up, the Digimon rushes straight ahead over the Digimon and lands in front of the beach.
"They must be punished, no one will stand in my way! They have stolen a shoulder piece of my armor and hid it away in the sea!" roars one of the fiercest KaiserGreymon that you ever met. When a Poyomon finally makes its way to you, he says with great fear: "We are innocent, it's only a couple of us that made the mistake of playing with your armor, please forgive them. They are currently in the sea searching for the lost armor piece."
But KaiserGreymon would have none of it and rushes forward, directly at your team. You need to find the legendary piece while your team holds off the Digimon!