This series focuses on the neck and the convulsing arched upper body, with the motto "Seriousness is justice!" because the "arched back angle" that is avoided in ordinary AVs because the woman's face is hard to see. In this work, Mikuru Horikita, who has a flexible female body that can even do y-balance and lateral splits with an I-cup, appears. Her arched back when she reaches ecstasy, having experience with ballet since she was a child, is full of power! Furthermore, I am excited by her body that wants it again and again!