Blue Star: Get Out of the Galaxy!

The anti-gravity engine is the most powerful engine in the universe. With it, interstellar navigation can be carried out at will. Its principles and properties are extremely simple. Almost any creature can easily discover its existence as long as it has a civilization. Then all the technology trees are used to create and upgrade anti-gravity engines. As a result, the technological level of the aliens who have mastered the anti-gravity engine is not high, their weapons are simple, and they have just mastered electricity. But they still endlessly attack other planets in the universe that have mastered anti-gravity engines. After all, the technological level of these planets is the same as theirs. Until a certain day. An imperial reconnaissance ship discovered a blue planet in the solar system. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.