Also known as: スプライト; 末日降臨
Yoshiko is a 2nd year in high school; while studying for her entrance exams, she also drops off her copied notes to her Hikikomori childhood friend every morning. She also takes care of her reclusive uncle. Her friends, Miki and Kiriko follow her morning/ evening commutes. One day, they went to deliver the notes like always, but for some reason only Yoshiko could see the "Black snow" dancing in the air, and things just keep getting stranger.
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