フラストレーションガールズ : Mura Mura Girls ready for you!!
ふらすとれーしょん がーるず : むらむら がーるず れでぃ ふぉー ゆー
est. Rough estimate based on volume count, reprints and magazine — not an official figure
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections