Sachiko, a parking inspector aka midorimushi (euglena), is paired with veteran inspector Chinen. At first, Sachiko doesn’t fully accept Chinen’s rule-bound attitude, but she is gradually influenced by him. Meanwhile, midorimushi hunting is becoming popular in their town.... 駐車監視員、通称ミドリムシとして働く幸子はベテランの知念とコンビを組むことに。最初は四角四面な知念の仕事に疑問を持つも、徐々に感化されていく。そんな中、街では「ミドリムシ狩り」が流行り始めていた…。
