Little Mika has been waiting to go to the beach with her father all summer, but every time they’re about to head out the door he receives an important call from work and has to reschedule. This time though, they’re definitely going – Mika even picks out an inflatable dugong floatie for her dad because he can’t swim. But right when they’re getting into the car, the usual occurs. Disappointed, Mika is now forced to play in a kiddie pool in the backyard instead of the ocean, but it’s not so bad – especially when the plastic dugong comes to life!
When Daikichi's grandfather dies he leaves 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 isn't even all that comfortable with 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, navigating each of life's bumps along the way.