Based off the Manga commonly known as Bunny Drop, This anime is about 30-Year-old Daikichi who, after his grandfather's funeral, decides to take care of his grandfathers 6-year-old illegitimate daughter; Rin. Usagi drop is a 11 episode series reaching half way through the manga. The Manga hold 6 books, 3 of which show Rin as a teenager.

I, personally, loved this anime and the manga too, and is currently my favorite anime, seconded by Papa No Iukoto O Kikinasai! and Cowboy Bebop.