Responses
It was explained through drawings on note paper at first/second chapter, maybe you can reread and look at it more carefully
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She died when she went out with an umbrella to lookin for the mc ((He probably went out to find medicine to reduce her fever because she was sick)) During the heavy blue snowfall, she was hit by a falling traffic light pole and yeah.. that was really sad

Wait. Did the little girl died in the room or did she came out and died on the snow??