Miyu Kozuki, an eighth-grade girl whose parents are temporarily moving to the United States to work for NASA, finds her peaceful life upended when she is sent to live with family friend Minoru Saionji, a Buddhist monk. Upon arriving at the temple, Minoru immediately departs for India, leaving Miyu alone with his taciturn, UFO-obsessed teenage son, Kanata. Despite their initial awkwardness and clashing personalities, the two teenagers are forced to coexist under the same roof.Their lives change forever one stormy night when a mysterious Unidentified Flying Object crash-lands in the temple’s garden. From the wreckage emerges a cute, floating infant alien named Luu and his peculiar, shape-shifting, cat-like nanny, Wanny. Stranded millions of light-years away from their home planet of Otto, Luu’s ship projects a holographic recording explaining the situation. Realizing the baby is helpless in a strange world, Miyu and Kanata reluctantly agree to take care of Luu until his parents can return for him, using Wanny’s advanced alien gadgets to manage the chaos of raising an infant with telekinetic powers.Maintaining this cosmic secret proves to be a daily, high-stakes farce. Miyu and Kanata must juggle the rigorous demands of middle school life while shielding Luu and Wanny from the prying eyes of
the neighborhood. Their greatest threat comes from Chris Nozaki, a sharp-witted classmate whose obsession with the paranormal leads him to relentlessly investigate Miyu and Kanata. Meanwhile, they also face opposition from Nozomu Gunma, a classmate infatuated with Miyu, and the overly dramatic classmate Ayaya Hanamikoji, who constantly attempts to exploit the household’s bizarre happenings for attention.As the months progress, the temporary guardianship deepens into a profound emotional bond. Miyu and Kanata transition from reluctant babysitters to devoted surrogate parents, learning the immense weight of responsibility, sacrifice, and
unconditional love. Simultaneously, their shared trials ignite a slow-burn romance between the two teenagers, though their teenage awkwardness often prevents them from expressing their true feelings.The dramatic climax arrives when Luu’s true parents finally locate their son and travel across the galaxy to bring him back to Otto. Facing the heartbreaking reality of separation, Miyu and Kanata must confront the end of their extraordinary chapter. Though Luu ultimately returns to his home planet, the experience forever transforms Miyu and Kanata. They are left with cherished memories of an impossible year, fully aware that their bond was forged in the stars.