Mukai said that he felt responsible in various ways to ensure that the film could be completed as if he was sending his child to see the world. He also revealed that on the last day of the filming of NHK morning drama "Gegege no Nyobo" in 2009, he passed a copy of his grandmother's diary to Yamamoto who was the scriptwriter but it probably turned out for the better that the movie was only completed at this time thanks to the cast and staff members he managed to assemble later. In this era where family ties tend to be weaker than before, he also hoped that the movie will serve as a catalyst to get family members talking to one another. Meanwhile, Ono revealed that she initially thought that Mukai was the one who chose her to play his grandmother but it turned out that he had given up the right to choose the cast lineup right from the start so she was rather disappointed to know about this. Mukai explained that he found it difficult to think of someone to play his grandmother so he had to leave it to others to make the decision.
Sources: Nikkansports / Sanspo / Sponichi / Oricon / Eiga.com