According to TOMINAGA Haruka's blog,who is a member of "Especia",SANNOMIYA Chika gets spanking with a baseball bat as a penalty game in Chika's birthday event!
Her blog is written in Japanese,but we all might enjoy some pics below...
pics:http://ameblo.jp/haruchaaaaaaa-n/image-12037005684-13332660585.html
blog post(in Japanese):http://ameblo.jp/haruchaaaaaaa-n/entry-12037005684.html