Apple

Organization
the ‘adventurers of origin’ is a words that denote the members of Apple Name Aznoval, Rokuya, Ginebia, Haku Mokuren, Hitsuna; it was form with around 10 people, and their names are absurdly popular and there’s a lot of epics and anecdotes about them. Rokuya-san has left numerous stories of being a chivalrous thief as an assassin.

it is possible they are all immortal because there believed to be the same people

Encountering
Hokuto and Shii both consider them to have ‘outrageous’ ability, and has the looks of a dancer and the other a sister.