I love this kind of art and story. Where a single man has to take care of a child and everything changes in his daily life. It is still odd to think of Rin's mother in a relationship with such an old man (a 50 years difference more or less?), but it is nice to read how Daikichi comes to grow up trying to be a parent, without being corny or too fast.
And it does help that I have the movie in my PC to watch it, with the sweetest actress girl as Rin.