The covers have been revealed for Watanabe Mayu's 4th single [Rappa Renshuuchuu]. The single will be released on the 10th July 2013 in 5 types. Three CD + DVD types, A, B and Limited Edition, and two CD only types, Regular and Limited Edition which comes with an artbook.
The cover for the limited edition with artbook is fan design held by an online contest. Mayu herself helped judge the winner. 13 runner-up entries will appear in an illustration book that will be included in that edition. View the winner and 13 runner-up entries at the official pixiv site here.
Type A Type B Regular
LE (CD + DVD) LE (CD + artbook)
The other interesting thing is that this song is a collaboration with OreSkaBand (オレスカバン):