Brigadoon: Marin & Melan
Rated by only 507 MAL members (as of this post), and only previously mentioned once in this thread, this is likely to be the most obscure 2+ cour action anime I've seen yet. And that is a tragedy, because this anime is an unsung masterpiece. It wasn't without its share of problems, but the touching story, lovable main character duo, breathtaking drama, and exciting direction made this anime a unique and unforgettable experience for me. Seriously, I urge the others here to watch
Brigadoon, it needs more love.