Kitagawa comments that right before they filmed the kissing scene, "My heart pounded when I learned that I'll be kissing Kyoko-chan. I felt so ashamed after we did it". Fukada on the other hand comments, "I was nervous. But the staff were also very nervous".
The movie is based on the 1997 novel of the same name written by mystery writer Aya Imamura (1955-2013). Harumi (Kitagawa) and Reiko (Kitagawa) hit it off, start sharing a room, and live a happy life, but Reiko suddenly starts acting inexplicably.
Despite being a suspense movie where you'd expect a tense air on location, Kitagawa looks back and said, "She's a senpai, but Kyoko-chan treated me like a friend who's my age, and it felt like I was in school". Fukada also comments, "Keiko-chan strengthened the cohesiveness of the girls. I really had a lot of fun".
Others in attendance were Kora Kengo, director Takeshi Furusawa, and rock band androp.
Source:
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