A Call from 54,600 Years Ago

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This book is a remake of Playing in a Crossover Under the Guise of Honkai. The plot will change significantly, though some of the setting will remain the same. Please take note.

A reminder in advance: please don't flame me in the comments.

For various reasons, the quality of the first volume isn't great. I hope you'll stick with it until the second volume. Feel free to share your thoughts at any time.