“What part of – how is Ryuryoku Kako getting in the way?”
“Let’s walk through this step by step. What’s the basic premise of Fatal Orchid Four?”
Two months ago, in Satsuma.
This was the move Shichika had used against Kanara Azekura, in their battle at the Basket – the armor-piercing Fatal Orchid of the Kyotoruyu.
Among the Seven Forms of the Kyotoryu, it was the only time he made a fist – launching from Form Four, the Asagao, this blow bypasses the surface.
No buckler or block can shield you from its impact, which demolishes your insides but leaves your skin unscathed – theoretically, the move could blast someone on the other side of the planet.

Katanagatari Omnibus 3, Page 53