Mayumi Tsuwabuki

Lady Mayumi Tsuwabuki (石蕗 真弓, Tsuwabuki Mayumi) is the younger daughter of the Tsuwabuki head family and the younger sister of Kureha Tsuwabuki. She is the chosen one to be sacrificed in the earth-users' grand ceremony; however, her father, Iwao Tsuwabuki, did not have the heart to kill her and instead cloned her to spare her life. Thus, Ayumi Tsuwabuki, a younger clone version of her, was created to be used as the sacrifice in the Taisai, a chi-jutsushi ritual of taming the behemoth of Mt. Fuji, Zenon, that takes place every 30 years to prevent the volcano from erupting. The ritual, first performed 300 years ago, involves sacrificing the life of a Chijutsushi of the Tsuwabuki family.

Appearance
She is described as a beautiful young girl by Yuuji Tsuwabuki, her personal bodyguard since young, with light brown hair and aqua green eyes. Her younger clone version, Ayumi Tsuwabuki, shares the similar appearance to her in her own younger years.

Personality
She was shown to be initially cold-hearted and since her first appearance as she treated her allies, especially towards Ayumi Tsuwabuki (her clone) and sometimes towards Yuuji Tsuwabuki (her personal manservant/ bodyguard), like objects to order around and command. This is shown to be under her older sister, Kureha's, influence.

However, it was shown in flashbacks that she was more caring when she was Ayumi's biological age. In a flashback on her childhood (when she is told she will be sacrificed), she kisses Yuuji Tsuwabuki, her personal manservant, and has him pledged his allegiance to her until she dies. In this instance, she is shown to be kind and innocent, as well as selfless at this time, telling him no matter what even if she runs to always bring her back and make her fulfill her duties. At the ending of Episode 12, where Ayumi ended up sacrificing herself in Kazuma, Ayano and Ren's difficult fight against the behemoth of Mt. Fuji, Zenon, Mayumi recovered her consciousness and at that moment, realized the mistake she had committed treating Ayumi in the reckless way she did. She apologized and changed back to her caring ways after Ayumi saved her and the rest of them and was dying.

Plot
She was destined as the chosen one of the Tsuwabuki family to fulfill the grand ceremony ritual performed every 30 years to keep the seal of the Mt. Fuji demon safe at the cost of her life, but her father, Iwao Tsuwabuki, attempted to save her from that destiny by creating a younger cloned version of her, Ayumi Tsuwabuki, so that she could take Mayumi´s place in the ceremony.

Her older sister, Kureha Tsuwabuki, was being somewhat manipulated by the beast that they are trying to seal and thus, purposely puts Mayumi's life at risk against their father's wishes after turning him to earth and ultimately killing him. Under Kureha's influence, Mayumi is seen as heartless and cruel to her clone, Ayumi.

When Ayumi escaped and ran away with Ren Kannagi in Episode 10, she went after them with her manservant, Yuuji Tsuwabuki, and they succeeded in capturing her. However, once they got back to the Tsuwabuki's family mansion, her older sister Kureha, lead them both away towards the ritual chamber with the intention of unknowingly sacrificing her along with Ayumi in order to complete her plan of gathering all the energy of the beast under the mount, to gain her very own powers which was vacant to her since young. Later, the end of Episode 12, when Ayumi sacrifices her life to help Kazuma, Ayano and Ren to defeat the behemoth of Mt. Fuji, she feels remorse against the reckless way she treated Ayumi over the years, and apologizes to her as she laid dying.

Chi-Jutshushi
She may be the only person in the family that has Earth magic, since her older sister, Kureha Tsuwabuki, does not (later revealed to have been locked away by Zenon, the behemoth of Mt. Fuji since birth).

Ayumi Tsuwabuki

 * Ayumi is the younger version clone of Lady Mayumi, with the egg of next pixie king (the stolen treasure of the pixies) infused with her so that she aged faster than a normal clone, in order to be sacrificed instead of Mayumi at the earth-users' grand ceremony. She treated Ayumi in a reckless way because she saw her as a mere object and never stopped to think that she might have feelings, just as a normal human, being a clone herself. Yet, she feels remorse against the mistreated treatment she gave towards Ayumi at the end of Episode 12, then apologized to her and changed back to her caring ways after Ayumi sacrificed her life to help Kazuma, Ayano and Ren defeat the demon behemoth of Mt. Fuji and was dying.

Kureha Tsuwabuki

 * Kureha is Mayumi's older sister who was born with no earth magic since birth. It is unknown as to whether both sisters share a close or good relationship. Yet, it was briefly shown in Episode 10 in the Tsuwabuki family's mansion, that she holds a certain level of respect towards her sister, whether it was out of fear or respect as the older sibling and being then the head of the Tsuwabuki family, in replacement of their father. However, she was lead away by her to be unknowingly sacrificed along with Ayumi in the grand ritual ceremony in order for Kureha to fully obtain the behemoth's full power.

Yuuji Tsuwabuki

 * Yuuji is Mayumi's loyal personal servant and bodyguard assigned to her since young. It was revealed that she has a crush on him. It was shown in a flashback on her childhood (when she is told she will be sacrificed), she kisses Yuuji and has him pledged his allegiance to her until she dies. She is kind and innocent as well as selfless at this time, telling him no matter what even if she runs to always bring her back and make her fulfill her duties. His high degree of loyalty towards her, whether it was out of duty or not, was shown throughout Episode 9, 10 and 11. In the ending of Episode 10, he was shown to be worried for her initial missing whereabouts; later, upon seeing and hearing about Mayumi's power being lent to Ayumi to aid in the grand ritual ceremony from Kureha herself, he was shown to have taken Kureha's offer of lending more power (she was unknowingly hosting part of the behemoth's power and lead to completely possessing Yuuji's being when the power fused with him) to protect anyone from intruding the ceremony itself to ensure Mayumi's life out of harm's way. He was freed from the beast's complete possession of him in his later fight with Ren Kannagi during Episode 11, who used his own Golden Flame of Purification to purify him.