Past Events in the Starry Sky

(The original name of "Starry Sky Past" is "Tritium Entropy Potassium") Captain Wang, an ordinary student in an ordinary high school in an ordinary small county in China, invaded by alien races, and heroes emerge in troubled times. Captain Wang does not know what kind of things he is involved in... (My writing is not good, please do not go into details if there are any illogical things in the book)