![1girl braid brown_hair closed_eyes commentary_request dogeza hair_over_shoulder idolmaster idolmaster_cinderella_girls mistrail pantyhose senkawa_chihiro single_braid skirt solo rating:s score:10 post #2073656](/cdn_image/preview/b0/8d/b08d06be6aeb3a89b21f666579f6338c.jpg)
An element of Japanese manners by kneeling directly on the ground and bowing to prostrate oneself as touching one's head to the floor in order to show deference to a highly revered high-class person, as a deep apology, and to express the desire for a favor from said person.
For the pose itself (without the intent of deference or apology), see orz.