Senyuu literally translates into short story, and that is what you are getting out of 'Senyuu'.
Each epsiode is 5 minutes long, with enough chuckles to fill a chucklebox. Everything about the anime(art, sounds, characters) are all at good at best, but where this anime stands out is through its quick and witty humor.
'Senyuu' follows the story of a king sending soldiers to fight demons, but is focused on bits of interactions between characters, which is brilliant because they are able to divulge on the fast-paced funny and interesting jokes and parodies while also having something to tie it to.
If you get tired of the shouting matches of the Big 3 Animoos, or the twists and turns of the more complicated animes (which is saying pretty much everything else because a blank canvas can be at times more complex than 'Naruto' or 'One Piece'), I would totally recommend you turn on Senyuu; open a bag of snacks and pop a drink, and go for the wonderful short ride of Senyuu..desu.