女主角渡部椎名（渡部シイナ）想往日一样同好友东云白雪（东云白雪）乘坐公车上学，在车上椎名和白雪谈起昨日朋友送给她的古代蝴蝶的翅膀标本。同车的另一个少女（胡沢泽ジェシカ）看到标本后竟然说了一段莫名奇妙的语言。接着突然公车发生意外，剧烈的摇晃后，少女们挣扎的站起来。而此时司机已经不在，窗外的风景已经由房屋变成是一片高大的森林。。。密林深处少女们如何求生。

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