according to the blog post (in Japanese) below,
Chisei is punished by MORISAKI Tomomi,both of two girls join the group named OSU.
And we might watch spanking scenes including Chisei's spanking after 13:30- at
「アイドリぃむTV【一番腹黒いと思われてるのは誰】11月23日」 https://t.co/V4WIkx77OZ— ryu_spanking (@ryu_spanking) 2016, 1月 11
and enjoy pic,here,