The story of The Tatami Galaxy follows an unnamed third year university student in Kyoto, Japan and what he views as his wasted time in a particular club (also called "circle") at his university. He meets Ozu, another student, whose encouragement sets him on a mission of dubious morality. He contemplates his affection for a second year engineering student, Akashi, and makes promises to her, usually of and within a romantic subtext. The culmination of his dubious missions often conflict with his interest in her in some way. The story is one of a number that draw on the author's experience in Kyoto University.