When 30-year-old Daikichi returns home for his grandfather's funeral he learns about the existence of Rin, his grandfather's illegitimate six-year-old daughter by an unknown mother. The girl is an embarrassment to all his relatives and is treated as an outcast. Annoyed by their attitude, Daikichi decides to take care of Rin himself, even though he is single and has no experience raising a child. As Rin becomes part of his life, Daikichi experiences the hardship of a single parent. He is befriended by the single mother of Kouki Nitani, a friend Rin meets in nursery school, who gives him advice on raising Rin. After a year has passed, Daikichi acknowledges his sacrifices for Rin have been worth it. The first half of the series focuses on Daikichi's perspective and struggles raising Rin. Ten years later, Rin is a high-school student and the remainder of the series focuses on her trying to figure out how to deal with her feelings for Kouki, and her decision for a career. Rin discovers that she has no family ties to Daikichi and the series ends with Rin planning to have a child with Daikichi.Daikichi Kawachi (河地 大吉, Kawachi Daikichi)
Daikichi is a 30-year-old single man and the adoptive guardian of Rin. With Rin living in his home, Daikichi quits smoking, cleans his house, and reluctantly cuts back on work hours. Despite his irresponsible life style, Daikichi is a very hard worker and considered the best in his department. He is insecure about his style on raising Rin, always asking his co-workers or Yukari for guidance. Yumi Unita stated some events Daikichi faced when raising Rin were based on her personal experiences. He appears to like Yukari. He is voiced by Hiroshi Tsuchida in the anime and portrayed by Kenichi Matsuyama in the live action film.
Rin Kaga (鹿賀 りん, Kaga Rin)
Rin is a six-year-old girl and thought to be the illegitimate daughter of Daikichi's grandfather, Souichi Kaga (鹿賀 宋一, Kaga Sōichi)
and manga artist Masako Yoshii (吉井 正子, Yoshii Masako)
. Masako abandoned her for the sake of her career. She is strongly independent and mature, often dealing with issues on her own. Living with Daikichi, she develops a fondness of cooking for him. Rin begins to wrestle with her feelings when Kouki starts wanting to have a deeper relationship with her. Rin comes to realize that she loves Daikichi, but is hesitant to pursue a relationship because they are related. Near the end of the series, however, Rin learns that Souichi was not her biological father and only adopted her. After this she opts to stay with Daikichi for life and marry him. Her child self is voiced by Ayu Matsuura in the anime and portrayed by Mana Ashida in the live-action film.
Kouki Nitani (二谷 コウキ, Nitani Kōki)
Kouki is a boy Rin befriended in her daycare. He is an immature brat, but has grown fond of Rin as they are both raised by a single parent. When they are teenagers, Kouki desires to pursue a deeper relationship with Rin. Kouki later realizes that Rin loves Daikichi and works to help her confess her feelings to him, consistently acting for her best interest despite himself. His child self is voiced by Noa Sakai in the anime and portrayed by Ruiki Satō in the live-action film.
Yukari Nitani (二谷 ゆかり, Nitani Yukari)
Yukari is an attractive 32-year-old divorced woman who is Kouki's mother. She gives guidance to Daikichi Kawachi on raising Rin. Yukari is voiced by Sayaka Ohara in the anime and portrayed by Karina in the live-action film.
Bunny Drop was written and illustrated by Yumi Unita. The untitled chapters were serialized by Shodensha in the monthly josei magazine Feel Young between October 2005 and April 2011. Part one, which is collected in the first four volumes, concluded in the April 2008 issue, with part two (which skips ahead ten years) beginning thereafter. The chapters were collected in nine wide-ban volumes, the final volume released on July 8, 2011. A spin-off series, also by Unita, entitled Usagi Drop: Bangaihen was serialized in Feel Young from July 2011 to December 2011 and collected in one volume.
The series has been licensed in English by Yen Press and in French by Delcourt. Yen Press have published nine volumes as of August 2013 and the Usagi Drop: Bangaihen volume has been released on April 22 of 2014 as the tenth one.
In June 2010, production on a live-action film adaption of the manga was announced. The film was directed by Sabu and was released in Japanese theaters on August 20, 2011.
An anime television series adaptation of the manga produced by Production I.G aired on the noitamina timeslot on Fuji TV between July 7, 2011 and September 15, 2011. Toho, Fuji TV, SMEJ, Dentsu and Shodensha were also involved in the production of the series. In addition, the series can be watched on Kansai TV (July 13 – September 21), Tokai TV (July 15 – September 23), TV Nishinippon (July 21 – September 22, every 2 weeks, 2 episodes per day, last 3 episodes on September 22), BS Fuji (August 7 – October 23) and Hokkaido Cultural Broadcasting (October 10 - December). The series was also simulcast by Crunchyroll and Anime News Network. The series was released on four Blu-ray Disc/DVD volumes between October 28, 2011 and January 27, 2012, each containing a bonus mini-episode. The opening theme is "Sweet Drop" by Puffy AmiYumi whilst the ending theme is "High High High" by Kasarinchu. The anime has been licensed by NIS America who released the series on Blu-ray and DVD combo pack including an artbook and extras on August 7, 2012.Bonus episodes
Rin and Daikichi appear in a DLC pack for the PlayStation Vita game, Touch My Katamari, which was released in Japan on May 24, 2012.
About.com's Deb Aoki praised the first volume for its "heartfelt drama and slice-of-life comedy", uncluttered artwork, storytelling, and the relationship between Daikichi and Rin. She notes that the artwork is a bit plain and simple. Danielle Leigh's also praised the art and the parent and child pair, calling the relationship moving and amusing. Comicsworthreading.com's Johanna Carlson commended Daikichi's character to be realistic as if he were an actual Japanese single father. She rated the first volume as one of the best manga of 2010. Carlson expressed appreciation for the small moments where Daikichi learns what it is to be a parent and states the series is unique to the manga market. The manga was a candidate for the 2011 Eisner Award in the Best U.S. Edition of International Material-Asia category.