Daikichi Kawachi, a bachelor, is surprised to come across a young girl named Rin Kaga all by herself in his grandfather's garden on the day of the funeral. He is further astonished to learn that Rin is believed to be his late grandfather's illegitimate child. Sadly, due to this shameful fact, no one in the family is willing to take her in after her father's passing. Outraged at the callous reaction towards the innocent child, despite his youth, single status, and lack of parental experience, Daikichi declares that he will take on the responsibility of caring for Rin himself. This adorable tale titled Usagi Drop, explores how Daikichi and Rin attempt to discover happiness and a sense of purpose from their fortuitous encounter.