In the first story featuring Hirosue, she will play a struggling actress trying to make ends meet with her part-time job after she did not secure a role in the hit drama "Beach Boys" in 1997. Takeuchi will appear as herself in this story as a popular actress who Hirosue is jealous of. The second story featuring Igawa will describe how she tries to switch career paths from a model to an actress but with limited success as she did not release her hit photobook "Good vibrations" in 2001. She is irritated about the lack of progress in her stagnant relationship with her boyfriend (Fujiki Naohito) who is the president of a company. As for Saito, she plays the role of a former pure image idol who rejected the offer to act in the drama "Sukeban Deka" in 1985 and works as the mamasan of a bar now. While interacting with Kaho who plays herself and is a popular actress, Saito tries to regain the youth she lost by becoming an university student in her 40s.
Hirosue commented that she enjoyed the special and interesting setting in Baka Rhythm's story which mixes reality and imagination while Igawa echoed the same view about acting in a parallel world. As for Saito, she felt that it was worthwhile to act in this drama since there were many unknown things she could experiment with in the story.
In real life, Hirosue who made her debut in 1994, was a popular teen idol who became an actress and took part in many dramas and movies such as "Okuribito" in 2008 which won the best foreign language film at the Oscars. She remarried candle artist Candle JUNE in 2010 and has 3 children i.e. 2 boys and 1 girl. As for Igawa, she made her debut in 1999 where she switched from a model to an actress and has been seen in dramas and movies such as NHK Taiga "Hana Moyu" in 2015. She married fashion designer Matsumoto Atou in 2006 and has two children i.e. 1 boy and 1 girl. Saito made her debut in 1984 and was an idol who later became an actress and singer. She got married in 1994 and has 3 children i.e. 1 boy and 2 girls.