在一个巨大的宇宙中 - 那里有成千上万的行星 - 其中一个特别居住在一个奇怪的生物中，迭戈发现在强烈的失忆症之后，除了死亡之外，还变成了天使。
这个生活在这个陌生世界中的生物命令迭戈前往被称为行星边缘的物理世界，寻找人类以换取有关他过去的信息。
那个人就是艾伦，但是...他为什么以及如何死亡？
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