Upon arriving at Astro Lodge to interview for the head chef position, Takumi Miyasaka discovers a dilapidated boarding house rather than an upscale restaurant. Despite his disappointment, Takumi showcases his culinary abilities, greatly pleasing the eccentric residents. The most delighted among them is the charming landlady, Mira Gotokuji, who falls in love with his cooking. Conversely, Takumi falls in love with Mira. He accepts the position of breakfast chef at Astro Lodge and moves into Room 5. Takumi quickly observes peculiarities about Mira; she is completely unfamiliar with modern technology and Japanese cuisine. Furthermore, Takumi hears an unknown voice emanating from Mira's room. What he fails to realize is that Mira is an alien who has recently arrived from another planet on a crucial secret mission.