Kyokujitsu Isshin-ryuu

The Kyokujitsu Isshin-ryuu is a style of swordsmanship passed down in the Kurogane Family.

Description
The Kyokujitsu Isshin-ryuu is a swordsmanship style taught in the Kurogane Family since the era of Samurai, taught to the children of the household. Due to Ikki being born an F-Rank, he was never able to join the other children in learning it. He, however, watched the training sessions of his brother, Ouma, who trained alone, even after everyone else, even the teachers left.

Techniques

 * Gou no Kiwami - Honoikazuchi: A technique, where the user performs a diagonal slash using one hand, then it is followed up by a strong punch using their other hand to further adding power to the slash.
 * Jin no Kiwami - Amaterasu: A secret technique, where the user delivers a fast slash at extreme speed using all their muscles and the reborn of twist of their body with their spine described as a slash made by their body and spirit unified.
 * Retsu no Kiwami - Amatsukaze: This is a secret technique taught among the Kurogane Household, where the user performs a continuous series of one-hundred and eight slashes, which overpower the opponent with strength and speed.

Users

 * Ouma Kurogane
 * Ryoma Kurogane (Possible)
 * Ikki Kurogane (Blade Steal)

Trivia

 * Due to no one in the Kurogane Family not wanting to teach him anything, Ikki stole glances from the training sessions of the other children. However, he was able to learn a number of techniques (if not all of them) via watching Ouma train on his own even when everyone left.
 * Kyokujitsu references to the flag used in Japan for Ground Self-Defense Force.