Butt Hardening
Midori's ass
Type Butt technique
Range Self range
Media Info
Manga Debut Chapter 53
Anime Debut Episode 4

Butt Hardening is a special ability possessed by various Keijo players.


Some players are capable of hardening their butts. In Midori Morimoto's case, she is able to harden her butt by taking more damage from her opponents. Some of them are also able to do it by accesing through various means. In Ayase Kurogiri's case, she is able to harden her butt by using "Autosuggestion" in order to activate her "Fairy Butt".

Known Users


  1. Chapter 78, page 16
  2. Chapter 74, page 9
  3. Chapter 53, page 4
  4. Chapter 150, pages 5-6
  5. Chapter 163, pages 3-5


Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.