It is directed by Haruki Kasugamori and written by Kimiko Ueno, with Shinji Takamatsu serving as chief director and Kōhei Munemoto composing the music.

He lands a gig at an old boarding house called Astro-sou, owned by a beautiful and charming landlady, Mira.

One day, while cooking for everyone, Takumi finally learns Mira's true identity: she is the crown princess of Planet Widi and she came to Astro-sou to find "the key" so that she can return to her planet and be crowned as its queen.

The story follows the daily life of the Astro-sou residents and how Takumi helps Mira in finding the "key".

The opening theme song is "Hohoemi Nōto" (ホホエミノオト, Hohoemi Note, "Smile Note"), performed by Ai Furihata,[2] while the ending theme song is "Kokoro no Kagi" (ココロのカギ, "Key to the Heart"), performed by Maaya Uchida and Soma Saito.