Gill Breathing Blues (鰓呼吸ブルース, Era Kokyū Burūsu) is the 9th volume in the series.
- Chapter 23: Gill Breathing Blues, Part 1
- Chapter 24: Gill Breathing Blues, Part 2
- Chapter 25: Bratatat Mom
Fish-man Libra agent Zed O'Brien looks for a moonlight gig to help defray the cost of his survival gear. But when a legendary arms dealer steals the apparatus, the Libra team must mount an attack on the dealer's heavily fortified hedquarters and retrieve Zed's gear before he suffocates!