The youngest brother after Shouka and Reishin, he acts as the proxy head of the Kou family. Because of his long rule, many outside of the clan believe him to be the true leader rather than Reishin. A man of traditions and family loyalty, Kurou wields the enormous power of the Kou to protest the arrest of Reishin, single-handedly causing nearly half the country to cease functioning when he orders clan members to not go into work. It is he who worked to get their father, the former family head, to pass over Shouka in favor of Reishin as the next clan leader, as he views Shouka as useless. In terms of personality, he and Reishin are more similar than he and Shouka. Though he may view his eldest brother with disfavor, which does not prevent him from taking action on those who would act unfavorably against Shouka. When Kurou found out that the servants of Shouka's residence stole all the valuables, while Shouka remained in shock over his wife's passing, the proxy head ordered that each servant, to the last of them, be found and shown the tortures of Hell. Not only did that happen, their severed ears and eyes were sent to their families to warn them against any such future behavior towards a member of the Kou family. Unbeknownst to Shūrei, Kurou comes to the capital in order to give her more protection than Shouka could offer that when she begins on the path of an imperial officer. To that end, he provides her the protection of the Kou clan via the travel pass made for her journey to the Sa Province to take up co-governorship. Though the mark on the travel pass was of the Kou (Yellow) clan's, as it was Kijin who issued the pass, the special "seven-colored" ink used could only be made by the Kou (Crimson) clan, marking her as a person of importance to them. He intends to have Shuurei and Kouyuu wed, with the two of them to lead the clan in the future.
Kokujin Sa is the youngest of the three brothers, whose kindness is regarded as a weakness by his family. He reminds Lady Eiki and Sakujun of a young Enjun. Kokujun is fond of his cousin Shunki, and he releases Seiran and Ensei from confinement so they can rescue her. However, Ensei lectures him harshly for letting others risk their lives, encouraging Kokujun to take action himself. As a result, Kokujun safely brings Eigetsu and Kourin to Kinka, concealing his knowledge that Kourin is not really the female co-governor. When the ring of the Sa clan is recovered, Kokujun takes on the leadership of the Sa clan with Shunki's support. He is close friends with Ryuuren Ran, who is the same age as Kokujin, and admires Ryuuren greatly. (Source: Wikipedia)
A shy and very intelligent thirteen-year-old boy from Seika Village in the Koku Province. He came to the Capital to take the Imperial Exams after passing the Provincial Exams at the age of twelve. His money was given to him by all the people in his village, to wish him well. He later lives with the Kou family since he sends most of what he earns to his village. He has another personality (Yougetsu) which comes out when he comes in contact with sake. Yougetsu unlike Eigetsu is a strong fighter and is very agile.
Sasafune is a mermaid that appeared in episode 8 when Takashi went to an inn with his male friends to study. She knew Chizu Sakanaka, the owner of the inn, when Chizu was small. She thought that Chizu had used her to get her mermaid blood, which is said to give immortality to the one who drinks it.
He came from a wealthy family, yet he was frail. He often sat by a tree and read. He was found by a youkai, named Miya. They both spoke together since then. As the seasons went by, he did not came one day. He was in a painting that Miya often carried with her while traveling. She stated that he always wanted to be and travel with her. Site: Episode 09 "The Man Amidst the Row of Cherry Blossoms".
Kyoushirou Kamui is an older, wandering samurai who took in little Kyouichi Houraiji after his father was killed. Kyoushirou became Kyouichi's kenjutsu shishou (swordsmanship master) and struggled to instill in the brash boy a sense of self and true justice; he could tell Kyouichi was running away from his feelings over his father's death, and it turned him into a self-righteous bully, much to Kyoushirou's disappointment. A mysterious man, Kyoushirou eventually disappears from Kyouichi's life during middle school, once more taking to the unknown road for no apparent reason. He leaves him in the care of the drag queens at Club Diva, where Kyouichi takes Kyoushirou's place as their "samurai-for-hire". Although not much is known about the wizened samurai from the omake (extra) episode in the anime, Kyoushirou was a key player and comrade-in-arms to Genma Hiyuu (Tatsuma Hiyuu's biological father) with a gaiden (side-story) in the original videogames "Tokyo Majin Gakuen Kenpucho" and "Tokyo Majin Gakuen Oboro-Kitan".