When Nakagawa first heard about the movie's offer, he was shocked to be playing a 27-year-old man even though he is only 18 and had played senior high school or university students most of the time todate. As such, he had to ditch his past experience and do a lot of research and imagine how he should behave as an adult in order to play his character. On the other hand, Taira who plays Chizuru having problems interacting with others, also revealed her worry about playing someone who is entirely different from her own personality. As such, she was feeling the pressure so much that she felt the stress and fatigue in her shoulders at the beginning of the filming.
As Nakagawa and Taira are graduating from senior high school this year, their co-stars and the director presented them with a cake with the image of a graduation certificate during the surprise celebration. Nakagawa thanked everyone for their gesture and pledged to work harder in future. For Taira, the filming of the movie coincided with the university entrance exams so she was glad to have made it to the university of her choice and thanked everyone for their support.
Meanwhile, Chiba who was the oldest among the cast to appear at the event (he is 27 now), was teased by his co-stars and the audience for being an ojisan (middle-aged man) but he didn't mind it and said that he is at the age where he hopes to be able to carry himself with dignity.
Sources: Oricon 1 / Oricon 2