Black Lagoon

[Ryllharu]

Each season of Black Lagoon was only 12 episodes, so there's actually a fair amount of the season filled up by whatever current arc the scans are on. It's considerably longer than most of the arcs that have preceded it. I don't know how far it goes but it is at least twice as long as the Calamity Jane arc (the Indian girl persued by half of Roanapur, protected only by Black Lagoon and the swindling Eda) that appeared in Second Barrage.

That's at least six episodes right there, half of the season. Plenty of canon material.

Though I would not mind one of the omakes out of the manga volumes to appear in an episode (maybe a dream sequence after a night of really hard drinking). The one where they regress the ages of the characters (Rock & Eda as high school age, Balalaika in elementary, Revy as junior high age, etc.) was pretty funny.

...and Shinji, to my knowledge, there haven't been any filler episodes outside of the one visit to the Church of Violence and the market that left Revy and Rock in a police car together, sharing a light. The arcs have just been presented out of order.