As a warrior devoted to justice protecting Earth, and as Makara Nozomi, a stunningly beautiful member of the Planetary Defense Force, she hides a secret identity: Princess Gracis, the most beautiful yet most vulnerable giantess from the Giantess Star in the galaxy. Risking her life each day to protect her planet from falling into the hands of evil alien invaders, she fights relentlessly. However, the cunning Archelon aliens devise a sinister plot—not merely to defeat her, but to transform her into a lustful beast and turn her into their sexual slave. Under their conspiracy, Gracis is brainwashed, her civilian-disguise capsule stolen, leaving her unable to transform and rendering her powerless. Infected by parasites without realizing they've invaded her genitalia, she retrieves the transformation capsule and reverts to Gracis, growing to giant size once more. Yet during battle, she senses a strange mutation within her womb, rendering her unable to fight. Gradually, she falls under alien control, her body degrading into shameless depravity, consumed by uncontrollable lust until she descends into madness… [BAD END]