Shadow Manor

Primarily consisting of ninja players, the Shadow Manor maintains a strong reputation of being assassins for hire, and not robbers, as they don't loot their victims. They usually avoid clan wars and territory challenges, since they don't have the resources to compete. Perhaps as part of fun RP, they have a habit of telling their victims, "You don't want to offend the Shadow Manor".

Nichi (clan leader - ninja)
The Shadow Manor leader, he is responsible for the ambush on Fuoka Army to steal the key. He later follows Kage to Kakura in search of the key.

Kage (ninja)
A ninja that Seiki met in Maji's house in Kakura Village. Kage asked Seiki to deliver a box to Ichikeya, which is the start to a big mess Seiki finds himself in later in the story. Considered a traitor by his clan mates.

Taka (ninja)
Taka is one of the ninjas who was after Kage in Kakura Village. He later challenges Ichikeya in order to regain the box. Seiki and Fuyu fight against Taka and somehow manage to kill him. This makes Seiki earn a reputation as a low level who holds his own against a level 19. The ninja uses a crescent glaive.

In the middle of book one, Taka and Hibi follows Seiki to the Shogun's Palace and attempt to kill him. They escape after they fail. Later, Taka ambushes and kills Seiki in revenge for the Ichikeya challenge.

Hibi (ninja)
Described as a small, nimble girl with half her face covered by a black mask, Hibi is one of the ninjas after Taka in Kakura Village. She and Taka follows Seiki to the Shogun's Palace, and being unable to kill Seiki since he is carrying an official army seal, she kills Mairin instead.