Sky Shadow.

Summary

In an ancient tree hollow, Lu Chen discovers two newly appeared doors, one of which has now partially opened, revealing a mysterious darkness beyond. Despite his curiosity, he hesitates to open the door, contemplating the potential dangers it may hold, reminiscent of past perilous experiences. He enlists the help of A Tu, his evolved black dog, who intriguingly interacts with the door and manages to turn the handle, causing it to creak open slightly, allowing darkness to seep in.

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