Rinne specials are a collection of 6 short episodes about the characters from the anime doing simple stuff. It's a slice of life comedy parody. Sadly the poster has more fanservice than the show itself, there is only one episode where the girls appear in swimsuits and not even that skimpy or in sexual positions. Xebec may be well known for ecchi for they didn't go all out here. All important characters from the main show appear, even those no-name classmates, all in all, it has cute girls doing cute things, let's just forget about the intergalactic war and mecha for 12 minutes. The episodes are fully animatedand all keep same design with the exception of one episode where we see them as chibi.
Watch this if you liked the homey atmosphere of Rinne no Lagrange and want to see more of the Jersey Club in funny and cute situations.