Recollection
He sees snow. Pure, white snow, falling from the sky onto the ground in the form of perfect icy crystals. Someone calls for him. Hiroki. He is smiling and waving, pointing at a big pile of snow.
They build a snow Yukidarumon. Together. They laugh at the absurdity of building a Yukidarumon out of snow when Yukidarumon are made of snow in the first place. They build little YukimiBotamon around the Yukidarumon, and Hiroki finds a cookie in his pocket and breaks it in half, offering to use it for Yukidarumon's eyes. They put the eyes in place and laugh again. Now it looks like a real Yukidarumon; they really created a Digimon.
And then a car passes, running over one of the snow YukimiBotamon.
In the present, Oikawa Yukio snaps out of his reverie. It's only a memory. A good memory of something that was never meant to last. He sinks a bit in his chair and frowns.
He dully notes to himself that both of the men from that memory are gone, and turns his attention back to the pair of pixilated eggs on the computer screen in front of him.