In line with the movie's title, the cast were asked what they would do 100 times to protect. In response, Sakaguchi said that he won't do it 100 times but will just achieve his aim at one go. Upon hearing this, miwa was baffled by his answer and commented to Ryusei who was beside her that she couldn't understand what Sakaguchi was driving at.
Despite the movie being a romance story, miwa, Sakaguchi, Ryusei and Izumisawa's characters are members of the same band so they went out to sing karaoke during the filming and spent a lot of time together. Sakaguchi commented that as this is the first time he played the guitar so he was unsure whether he should concentrate on his playing or singing during the performances.
Sources: Eiga.com / Oricon