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Tsuyu always makes it clear to her teachers and classmates that she doesn't cope well in the cold.
She has a frog Quirk, and as such her skin is naturally more clammy and fragile. When winter arrives suddenly and with little time for her to prepare, Tsuyu understandably isn't ready for it.
She's been on an emergency rescue mission with a small, mountain-side group that had abruptly found themselves short-staffed. Hopping along the perimeter of the mountain range and using her sticky hands and feet to climb up the sheer surfaces of the rocks, Tsuyu's been tasked with finding someone with a mountain goat Quirk that got lost while hiking. It's been cold all day, but she has heat packs pressed between her hero costume and the underlayer she's always wearing for protection.
Tsuyu makes the mistake of losing track of the others, losing track of what the weather is doing while she's peeking into crevices and crawlspaces.
She doesn't realise the snow has started falling until she peeks her head back out of the newest cave and is slammed with the full force of frigid mountain air. The delicate white flakes build up along her eyelashes quickly. Knowing her body temperature isn't high enough to melt them, Tsuyu makes the informed decision to start trying to descend to a more sheltered — and hopefully warmer — section where she can phone in for help.
The heat pads are still doing their job, but Tsuyu's been out so long that they're starting to near the end of their usefulness. With a quiet ‘ribbit’, she looks through the curtain of white separating her from getting someplace safe.
She won't make it down the mountain now, not when she can feel the piercing bite of the wind gnawing at her exposed face already.
Abandoning her idea of leaving the nook she's wedged in, Tsuyu decides the best course of action currently is to call in her situation before it gets too much for her radio to go through. She presses a gloved finger to the bulky headset she was told to wear, ready to relay her last known location and call for a rescue party of her own. A despondent crackle and the haunting fizz of static tells her she's too late.
Tsuyu feels herself slowing down. It's only been a few minutes between the snowfall starting and now, but she isn't built for this kind of weather. She hesitantly activates one of her emergency heat-packs, pulling it from her pocket and clutching it tightly while she retries again to get someone's attention.
The warmth will keep her alive just a little longer, Tsuyu reassures herself, ignoring how drowsy she's getting despite her best efforts. Snow this early in the season never lasts too long, she lies to herself, feeling her eyelids drooping shut.
The heroes find her body as the storm winds down later that day. The storm had blown in so fast, it had lasted so long.
It had lasted too long.