Kojin Jugyou is the second solo single by Japanese singer-songwriter misono, the former lead vocalist of the Japanese band day after tomorrow. The single performed well, debuting at No. 8 on the OriconSingles Charts and taking No. 15 for the weekly ranking, remaining on the charts for four consecutive weeks. Despite performing well, it did not surpass the ranking or sales of her debut single, VS, which peaked at No. 4. The title track was a cover of the 1973 song "Kojin Jugyou" by Japanese group pop group Finger 5, which was made up of Okinawan siblings Kazuo, Mitsuo, Masao, Akira and Taeko Tamamoto. The song has been covered by an array of other artists, including Momoe Yamaguchi and Junko Sakurada. "Kojin Jugyou's" lyrics were written by Yuu Aku, who had been in the industry since the 1960s. The song was originally composed by Shunichi Tokura. For misono's version, Takahiro Izutani arranged the music. Takahiro had previously worked with misono for her debut single VS, and composed the music for the Tales ofthe TempestNintendo DSrole-playing video game. The single's coupling track, "Pinkies," was written and composed by Takahiro Izutani, with misono having written the lyrical portion. Commercially, fans surveyed how they enjoyed "Pinkies" more than the single's a-side, even going so far as to say it was their favorite only behind "VS." Keeping in theme with her previous single, the music video for "Kojin Jugyou" carried a fairy tale theme, this time taking inspiration from the story of Cinderella, most likely inspired by the 1950 film adaptation by The Walt Disney Company. In the video, misono is shown to be unkempt and wanting to gain the affection of her crush, who's always surrounded by her female peers. A fairy hears her plea and comes to help, transforming her into a modern-day princess. misono's sister Koda Kumi would take inspiration from the video for her song "Koi no Tsubomi," which also featured a small fairy granting desires. To help promote the single, "Kojin Jugyou" was used as the ending theme for the Nippon Television seriesMiracle☆Shape throughout the month of May.
Music video
As with her previous single, "VS", "Kojin Jugyou" held a fairy tale theme, this time taking inspiration from the classic tale of Cinderella. The music video opens with misono playing baseball in the hall with some of her male peers, when the student she has affection for walks by, surrounded by his female peers. Too nervous to approach him due to her unkempt appearance, she prays that night. A small fairy comes to grant her wish, transforming her into a modern-day Cinderella. The following day, she tries to gain her crush's attention, but he is always surrounded by other girls and she's unable to approach him. The small fairy constantly tells her throughout the video that she must hurry, since the magic is temporary. Finally able to get her crush alone in the library, the magic vanishes when she approaches him and she runs off, embarrassed. The video ends with her, in her standard appearance, gaining the courage to talk to him when he's at his locker. misono's older sister, Koda Kumi, would take inspiration from the video for her song "Koi no Tsubomi". However, where misono's video ends with the fairy's magic wearing off, Kumi's video would end with the fairy's magic being permanent.
