), also known as Hip Whip Girl,[3] is a Japanese manga series written and illustrated by Daichi Sorayomi [ja].

It follows a gymnast participating in a fictional women-only contact sport, where players use only their breasts and buttocks to tackle opponents.

The story is set in an alternate reality where the women-only gambling competitive sport keijo becomes a fad in Japan.

After graduating from high school 17-year-old Nozomi Kaminashi, a gifted gymnast, enters the world of keijo.

[31] It was produced by Xebec, directed by Hideya Takahashi, written by Takao Kato, composed by Hayato Matsuo, and the characters designed by Keiya Nakano.

The rules of the defictionalized version were modified and protective gear for the breasts, rear, and thighs were added to make the sport "safer and more realistic".

A proof of concept video showed a match in action and the league planned to scout for interested parties and venues for play.