Imouto de Ikou!

When her family is overthrown in a coup, Princess Mayuka is sent to Earth to recharge the Ultimate Weapon. After studying the mating behavior of the Earth’s inhabitants, she decides to ask one of her research subjects, a college student named Yoshizumi, for help, but crash-lands on his rooftop. Taken hostage and shot with her own weapon by Yoshizumi, she is brainwashed into believing he is her younger brother. Fortunately, Yoshizumi grows fond of Mayuka and decides to assist her in her mission: awakening the power of Akiho—a red-haired, green-eyed, appetite-driven Ultimate Weapon—using “primitive stimulation. - Synopsis Imouto de Ikou! https://hentaicop.com