At 14 years old, Kazuto Iizuka was your typical teen boy, until he met Narue Nanase. After she rescued him from an alien attacker, Kazuto learned that Narue was half-alien and her father was an explorer in space. Despite her alien heritage, Kazuto asked her out on a date with the encouragement of his friend, Masaki Maruo. Narue was hesitant at first, but Kazuto's assurance that her background did not bother him led them to start a romantic relationship. However, their relationship was not without its challenges, such as dealing with Narue's alien sister and a ufologist classmate, Hajime Yagi, who doubted Narue's authenticity.
