Chiaki gets a baseball bat spanking in "27 hours TV 2015" aired on FNN.
I do not know the details,i guess she is punished in that way as a penalty game after losing the game named "otoko-gi-jyanken(one kind of a Rock-paper-scissors)".
In last yaer,a female TV announcer is spanked in this game.
Mf baseballbat spanking for June bride?
http://ryu4spanking.blogspot.jp/2014/06/mf-baseballbat-spanking-for-june-bride.html