Takahata will be singing the Japanese version of the Chinese song "Herijunzailai" which was the insert song for 1937 Chinese movie "San Xing Ban Yue" and had been sung by many singers to date including Teresa Teng, Watanabe Hamako, Judy Ong, Miyako Harumi and Ishikawa Sayuri. Takahata commented that the song lyrics speaks of straightforward love and how someone would feel as if there is a hole in his or life if the lover is gone from their lives. During the recording, she tried to sing as how she felt from the lyrics. As for her impression of Mukai, Takahata said that he had always given her the image of being a serious and passionate person so she was very happy to be able to take part in his challenge of making his grandmother's diary into a movie. On the other hand, Mukai commented that he knew that the song was not a simple one to sing but he was impressed with how Takahata had sung it and felt that it was perfect to be played during the ending credits roll.
Besides Mukai and Ono, the film also stars Kishimoto Kayoko, Suruga Taro, Issey Ogata, Narita Ishin and Nogiwa Yoko and will be shown in cinemas from 24 June.