Things That Happened When I Transmigrated into an Interstellar War

Interstellar, Spaceships, Major Military Battles, and a System. No Apocalypse

Military life on an interstellar battlefield, where the victor becomes king and the loser is disgraced, play the pig to eat the tiger

The Protagonist Is a Commander in a Game, and His In-Game Subordinates Come Looking for Him in the Real World

A game suddenly appeared on the protagonist's phone. After beating it, he became the ruler of the universe. Before leaving, he told his space fleet that if they ever ran into danger, they could go to the Sun to find him. A few days later, an alien fleet suddenly appeared outside Earth.

Fourth Calamity, Silly and Lighthearted

Recommendations, please!

Technology Novels, Preferably Without a Harem

Sci-Fi System Novels with a Sane Protagonist, Preferably One with Superpowers

What about male-oriented novels?

Any Stories Where the Male Lead Transmigrates to a Parallel World and Makes Video Games?