Daikichi's grandfather dies, leaving behind a young daughter named Rin. However, as most of the family is embarrassed at the idea of a 79-year-old man having a six-year-old child, they can't seem to figure out what to do with her. Disgusted by this behavior, Daikichi decides to take care of her himself, but he's a bachelor, has no idea how to raise a child, and doesn't even like kids! Now, Daikichi must do the normal things a parent does such as enroll her in school, buy her clothing and teach her about the life and world around her. But more importantly, he must also help her deal with her father's death and decide whether or not she should try to find her mother. Together, the two begin their unlikely relationship as father and daughter.
Meet Koiwai Yotsuba, the strangest little girl around. With a mind so straight it's twisted, Yotsuba takes everything in life at face value and sees everything with the eyes of impenetrable innocence. With her laid-back father, Yotsuba moves into a new house and makes new friends - friends whose minds boggle at the wacky and somewhat wise way that Yotsuba lives her daily life!
Both of these series are about a single man trying to raise a young daughter, despite having no knowledge or experience raising kids. Both stories are filled with the misadventures of of these young girls & their adopted fathers. While yotsuba is more comedic than usagi drop, they have many similarities, and if you liked one you're sure to enjoy the other.
If you liked Aishiteruze Baby or Usagi Drop you would like the other because they are both about single young men that are suddenly forced to be a guardian of a very young girl, and both take a while to get used to one another, with many mishaps and quirks along the way.