Add Wakayama Electric Railway to the list of operators who've gotten the Mitooka treatment. Video at Kamayama Station:
http://railf.jp/news/2016/05/27/150000.html
Their fourth theme train after the Tama (Tama the cat), the Omocha (toy), and Ichigo (strawberry) trains, it's called the Umeboshi Train. It's a play on words, replacing 干 meaning dry with 星 meaning star, although both would be read boshi in this situation. Revenue operation will begin on June 4.
Edit: as kvp points out below, the previous three sets are also Mitooka designs