In her pursuit of an alien criminal, Birdy Cephon Altera, a spirited officer of the Space Federation, lands on Earth where the fugitive hides in the fashion world. Adopting the persona of 'Shion Arita,' a model on the rise, Birdy juggles glamorous photoshoots during the day and interstellar chases by night. Meanwhile, Tsutomu Senkawa, a typical high school student, stumbles upon an extraterrestrial showdown in an abandoned structure. Caught in the chaos, he becomes a pawn in the conflict between Birdy and Geega. Tragically, Birdy inadvertently harms Senkawa in her battle against the alien, prompting her to merge his consciousness with hers to save his life. Now sharing a body, Birdy and Senkawa must navigate a complex existence, blending high school routines, modeling gigs as Shion Arita, and Birdy's perilous duties as a Federation agent.