This anime series is so good. The characters, the relationships, the story, the art, the music, the voice acting, the sound. Everything is so well put together.
And I can't help but think that Kikuhiko and Sukeroku (screenshots behind the cut) remind me of Hakkai and Gojyo. It doesn't hurt that they're voiced by Ishida Akira and Yamadera Kouichi. (And I can see why Hirata Hiroaki was chosen to replace Yamadera for the role of Gojyo, as they do sound quite similar at times.)