龜田誠治
"Kōfukuron" and "Suberidai" were produced by Hiroshi Kitashiro, who is an audio engineer and synthesizer programmer, and "Toki ga Bōsō Suru" was produced by Uni Inoue, who is an audio engineer and multi-instrumentalist. Seiji Kameda arranged all songs. Sheena wanted to release not "Kōfukuron" but B-side song "Suberidai" as a title tune. However, she gave up on the idea because of opposition from EMI staff.