· Okada Masayoshi, who is used to acting as a student, thought that he was going to act as a junior high school student when he received the appointment, but he never expected that the producer would assign him the role of a teacher. This is the first time Okada Masao has acted as a teacher.
· Matsu Takako can't swim. There is a scene of her jumping into a swimming pool. At that time, it was winter when the pool water was turbid and it was difficult to see the depths. Before filming started, she found the director and only asked one question: "How deep is this pond?" Nakajima said depressedly, "Don't you care about the plot and just want to know the depth of the water?"
· Director Tetsuya Nakashima lost ten kilograms during the filming process. It is said that when he filmed before, the staff around him would be thin, but he would get fat instead. When filming this film, Nakajima was particularly troubled. He spent a lot of thoughts on the character's psychology, so he lost a lot of time without a diet.
