Kashiwagi Yuki (20)

 A samurai from the infamous Kashiwagi Clan

Has a good 12 year friendship with Miyuki 

She found Mayu after a fight with a street gang

Known more as the Dark Samurai or Black         

Is Blackhearted on the outside yet a big softie on the inside

Wants to avenge her parents death

Watanabe Mayu (18)

  An infamous street thief

Collects information on other people as she meets them

Meets Yuki after the latter fought a street gang       

Betrays Yuki,  Miyuki and Yuko for money

Almost kills herself with grief    

Knows nothing of her sister (Miyuki)

Watanabe Miyuki (20)

Is a fisher woman because of her parents death

Has a good 12 year  friendship with Yuki

3-4 years before the story begins Yuki gives her a prized katana and a million yen (1/100 of Yuki's family earnings)

Assassinates famous people for money

Knows she has a sister so she is looking for her

Almost gets killed by an assassin but if it wasn't for the katana Yuki gave her she wouldn't be alive

   Oshima Yuko (23)

< Is Yuki's intell

< Feels she's responsible for the death of Yuki's parents

< A samurai from the second most infamous clan, the Oshimas yet her family are the 3rd richest 

< Feels suspicious of the both Watanabes as they both do wrong deeds

< Gets lethally injured after an explosion by Kojima Haruna yet she loves the latter