​Princess Mayuka, betrayed and exiled to Earth, seeks to recharge the devastating Ultimate Weapon. Struggling to understand human mating customs, she enlists the aid of college student Yoshizumi, one of her research subjects. But fate takes a wicked turn when a crash landing leaves Mayuka held captive by Yoshizumi and subjected to her own weapon. Brainwashed to believe she is his sister, Mayuka’s only hope lies in Yoshizumi’s changing affections. Together, they embark on a mission to awaken Akiho, the volatile Ultimate Weapon with flaming red hair, mesmerizing green eyes, and an insatiable appetite for power. Prepare for a thrilling tale of desire, manipulation, and the primal stimulation that will unlock unimaginable strength.​