Seikatsu Kōjyō Iinkai (Committee for the Improvement of Life) began its activities in the early 1970s, led by Kazutoki Umezu and Yoshiyuki Harada. Many musicians came and went and engaged in multifaceted activities, but one of the pillars was the so-called Life Improvement Committee (Matsugumi), centered on Koichi Shofaze. This work, recorded live in Masuda City, Shimane Prefecture, is the only work left by Matsugumi with the same members. The saxophone cuts like a knife into the solid trio's performance, which gradually becomes more heated. Considering Coltrane's "Impressions", it has an overwhelming amount of energy and density.