I'm a Keyboard Person, Not a Keyboard Warrior

(No heroine, no system, no time travel, unhappy writing, spoof) Give me strength, I am the Keyman! A group of high school students who don't like studying and love playing games. A highly developed country that still suffers from internal problems. An alien force with no bottom line for its ideals. But with the help of the keyboard in his hand, he defeated powerful enemies and traveled across the stars to find the secret.