In the middle of a horrific invasion of Earth by mysterious alien forces, reporter Wakatsuki Tetsuya encounters a scantily dressed extraterrestrial woman wielding a sword and striking a swath of carnage through the Terran ranks. Tetsuya is knocked unconscious during a scuffle, only to awaken onboard her spacecraft. To his amazement, she is Kahm, the invaders' princess, and she has chosen Tetsuya to play a leading part in her approaching wedding. As for the groom...