Were you confused by that out of context clip of Usagi Drop's single, adoptive father Daikichi (played by Kenichi Matsuyama) dancing? Seems like that was the general impression.
Well, it's gone offline. In its place, in time for the movie's August 20th Japanese opening, a new clip of the live-action Usagi Drop, featuring six-year-old Rin (Mana Ashida) performing in a school play.
Usagi Drop is the story of a 30-something bachelor who begins caring for the six-year-old illegitimate child of his recently deceased grandfather. The original Yumi Unita manga is published in North America by Yen Press and the anime streams on Crunchyroll.