INFO:

Muscle Ass: Full Release Butt Strength (全開尻力 (マッスル・アス), Zenkai Ketsu Ryoku Massuru Asu) is a technique used in Keijo. The user clenches their butt in order to draw out a great amount of strength to defend themself. However, it is unable to block the "Gravity Ass", and losses in terms of...