中学二年级学生的花、四叶、小栗、穂纪香是好朋友4人组。这日常是平和且明朗的，这样想着的只有花一个人。某日，寄件人不明的信件送到了花手上。扭曲的日常逐渐改变然后崩坏，少女们的性，慢慢被更大的暴力所玷污——。

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