Yami Clan

Yami Clan (夜見一族) were a family of assassins in the Hino Country and served as protectors of Goshu, under the Ryudo Clan.

Overview
The family gained notoriety for their magic swordsmanship and skills as assassins, earning them the name "Kijin" (鬼人). After demonstrating their power during the age of wars, the family became protectors of Goshu, an area at the edge of the Hino Country and under the rule of the Ryudo Clan.

When she was a child, Ichika Yami unintentionally killed the rest of the clan after her father drugged her using their Kikongan. Her brother, Sukehiro—with help from Ryuya Ryudo—took the blame for the killing and fled the country.

Abilities
The men trained as "magic swordsmen" (妖刀使い), coating their katana with their magic attributes in combat. The strongest of the clan would be given the title "Kijin" (鬼神).

The clan secretly used a drug, called "kikongan" (鬼魂丸), to induce bloodthirsty states in themselves and to forcefully draw out all of their latent magic power.

Trivia

 * Yami contains the kanji for "night" (夜) and "appearance" (見).