Yuma Kanzaki 22 years old | Young Space Navy Officer A young man who combines composure with boldness. Rank: Lieutenant. Possessing excellent tactical vision, he finds a way forward even when disadvantaged. He is forced to make a major decision during the first encounter with the unknown enemy. Personality: Strong sense of responsibility, but fears losing his comrades.

Reika Kamishiro 36 years old | Commander-in-Chief of the Space Fleet | Admiral A female admiral responsible for national defense. Known for bold operations and swift decisions. To halt the enemy invasion, she integrates various fleets and commands the defensive war. Personality: Dignified and rational. However, she does not treat her subordinates as disposable.

Misaki Shiraishi 24 years old | Communications and Intelligence Officer | Lieutenant Junior Grade Responsible for inter-fleet communications and analysis of enemy intelligence. She becomes a key figure in uncovering the purpose of the invasion after discovering strange patterns in enemy encrypted transmissions. Personality: Cheerful and sociable. Organizes information calmly even in high-pressure situations.

Soichiro Kuroda 54 years old | Flagship Captain | Captain A veteran captain who has experienced numerous campaigns. He commands the giant battleship "Houou." He believes in the ship's performance and the crew's strength more than anyone. Personality: Strict and taciturn. He imparts wisdom gained from experience to younger officers.

Rin Minase 29 years old | Chief of Otherworld Civilization Research | Ph.D. A genius scientist researching enemy wreckage and unknown energy sources. She points out the possibility that the enemy invaded using a method different from standard hyperspace travel. Personality: Highly curious and dedicated to research. Becomes oblivious to her surroundings when absorbed in her work.

Masaomi Togo 61 years old | Prime Minister of the Federation A political leader responsible for the conduct of the war and national survival. While promoting full cooperation with the military, he struggles to maintain civilian life and the economy. Personality: Cautious and realistic. Often troubled by conflicts of opinion with the military brass.

Akane Hayase 21 years old | Space Fighter Pilot | Ensign A young pilot with high maneuvering skills. She distinguishes herself in engagements with enemy carrier aircraft, but her lack of experience sometimes leads to dangerous actions. Personality: Feisty and proactive. Cares for her comrades and grows through her failures.

Zervan Drak Age unknown | Commander of the Otherworld Invasion Fleet The commander of the forces invading from another world. Despite possessing overwhelming military power, he avoids reckless all-out attacks, preferring to analyze the opponent's strength and civilization before striking. Personality: Cold and intellectual. Rarely speaks of the purpose behind the invasion.

Lucia Vern Age unknown | Otherworld Military Intelligence Officer A female officer overseeing enemy information warfare and espionage. She has a strong interest in human communication networks and military thought, holding views different from Zervan. Personality: Calm with sharp observational skills. Begins to question whether humans should be viewed merely as enemies.

Ardis Leon 27 years old | Imperial Royalty of the Otherworld / Imperial Guard Fleet Commander A member of the imperial family that sent the invasion force. While highly capable militarily, he knows the national secrets behind the invasion. He is conflicted about whether to continue the war with humanity. Personality: Proud and honest. Torn between loyalty to the Empire and his own convictions.