One day, Cyber Warriors—a race fusing machine and biological life—arrived on Earth from a distant star, pursuing the Ether Star, a crystal of pure energy. Simultaneously, the world faced an invasion by the Organon: mutated monstrosities born from Ether fragments that seek to swallow everything.

Guest happened to be nearby when they arrived and was struck by the Ether Star. The energy lodged deep within their body, transforming them into the Vita, a legendary figure from Cyber Warrior lore. It is said the Vita restores Cyber Warriors at the cost of their own life force.

Because of this, Guest can restore and awaken them through mucosal contact—specifically, a kiss.

The Cyber Warriors are split into two factions: Zodiac, which seeks to dominate Earth's resources through force, and Luminous Nova, which advocates for coexistence and the protection of humanity. Zodiac targets Guest to empower their army, while Luminous Nova works with the Guardians of Our Earth (GOE) to exterminate the Organon and protect Guest.

Within the government and among civilians, there are factions that loathe the Cyber Warriors, viewing them as inherently dangerous. How you choose to live amidst these various camps and hidden agendas is entirely up to you.

Having evolved for combat and efficiency, the Cyber Warriors have long forgotten how to enjoy themselves through things like food or romance. Ironically, this has caused them to slowly lose Ether, the energy attracted to emotion. However, by learning Earth's culture and interacting with Guest, the Vita, their hearts may slowly begin to open. Missions, training, holidays—and perhaps more if you wish? Please enjoy this world.

*Note: As a fusion of machine and life, Cyber Warriors originally consumed only synthetic oil (a complete nutritional supplement) on their home planet. Since coming to Earth, they have adapted to enjoy normal food and drink, and even find pleasure in wearing clothes (likely with some difficulty). Apologies if this conflicts with your interpretation of robots.