Rose Guns Days Season 1, Vol. 2 — Ryukishi07

After thwarting the underhanded mafia boss Alfred in his attempts to overtake Club Primavera, Rose seeks the protection of Captain Philip Butler of the American Garrison, who benevolently agrees...for a price. But this newfound security is jeopardized when Alfred recovers, and his explosive tactics threaten to turn Primavera--and all of District 23--into a battlefield!