Princess Mayuka Seduced to Awaken Earth’s Ultimate Weapon Akiho

After losing her kingdom in a coup, Princess Mayuka is tasked with activating the Ultimate Weapon, Akiho, by studying Earthlings and their mating habits. She crashes onto college student Yoshizumi’s roof, who mistakenly brainwashes her into believing she’s his sister. Yoshizumi eventually grows attached to Mayuka and agrees to assist her in awakening Akiho’s powers through unconventional methods. The trio embarks on a mission filled with humor, bonding, and the pursuit of Akiho’s hidden potential.