He's not used to seeing snow.
Where Naegi comes from, the winters are mild. It rains often, but any temperatures below freezing summon forth icy chunks of frozen water to pelt at his coat and sting his skin.
At Hope's Peak, it's different. With the cold gusts of winter come a blanket of snow that covers everything in sight.
He's in the courtyard now, bundled up like a little marshmallow and waddling around in Togami's oversized galoshes. (He had been forced to give them up, though he only relented after the combined willpower of Sakura, who honestly believed Naegi was skinny enough to freeze out there if he didn't dress warm enough, and Ishimaru, who took it upon himself to be Robin Hood's lawful cousin.) He struggles to bend down, the layers and layers of jackets restricting his moment. Eventually, he manages it, and scoops up a handful of snow between black gloves borrowed from Kirigiri.
He feels something hit his back, and he stands up as quickly as he can manage. Junko is behind him, carelessly tossing a snowball between her hands. Truly a Super High School Level Fashion Girl, she looks trendy even in her winter attire, though he does think it's strange to see her with a jacket buttoned up to her chin.
She grins at him. "You're so slow, Naegi! How's a snowball fight supposed to be any fun if you're just going to waddle around like a dumb little penguin?"
"I've never really been out in the snow before..."
Her tongue peeks out of the corner of her mouth as she leans back, and she steps forward to throw the next snowball, missing his face by just inches. "That makes two of us! Well, not real snow at least. I've been in a lot of fake snow for shoots, but that stuff sticks to my clothes and it really sucks. The real stuff is so much better. I like the cold. It's exciting!" She bends down and packing together as much snow as she can fit between her slender hands. "I missed you on purpose, by the way. This time you won't be so lucky!"
He tries to make his own snowball, but his movements are too slow compared to her, and before he knows it, he's laying face down in the snow, covered in countless mounds of ice.
Junko laughs triumphantly, and presses a single boot into the small of his back, pushing him deeper in. "Haha! Junko Enoshima wins yet again! Even good luck is no match for her beauty and prowess!"
"This is boring," she says suddenly. "Let's go inside."
He attempts to get up, but taking five seconds is apparently way too long for Junko. She growls, and forces him onto his feet, looping her hand in his to properly drag him back inside.
All in all, it isn't so bad.