Younger cloned version of Mayumi Tsuwabuki from whom Ren Kannagi falls in love.
Ren Kannagi found her wile he was walking home. She was singing to the moon near a park and they instantly became friends. But some Tsuwabuki family members appeared to take her away for apparently no reason and treated her as if she was a thing and not a human. The Tsuwabuki family was in fact one of the most rich and powerful ones and they had a legacy of earth magic users among their family. They were entrusted many years ago to keep the Mount Fuji under control, because it was the place were a terrible monster was ones sealed. Ayumi and Ren escaped from those Tsuwabuki guys and she had no other option but to tell Ren the truth. She was supposed to be used as a sacrifice the next day to keep the seal of Mount Fuji active for other 30 years, because the power of the beast that the mount held under its feet was so powerful that the seal needed to restored every ones, and the one that would perform the ritual would waste so many energy that only death was left for them. After this she asked Ren if he could take her to the ocean, because she had never seen it and wanted to see it before the next day. Once they got there they were attacked by Mayumi Tsuwabuki, who seemed to be Ayumi´s older sister, and her assistant. They told Ren the rest of Ayumi truth, that she was no human but a cloned version of Mayumi. Ren stood up shocked looking how they took Ayumi away, regardless he had told her that he would protect her from that dreadful destiny. The next day Ren reconsidered his decision and with the help of Ayano he entered the Tsuwabuki´s stronghold to save Ayumi. There they found out that Kazuma and Tiana the wind Pixie were also there for something, and after defeating Mayumi´s assistant ho had turned into a golem thanks to Mayumi´s older sister, Kureha, they interrupted the ceremony. The real thing was that Kureha, induced by the demon beneath the mount itself, awoke the entity with the hope to get his powers, because she had grown with no capabilities to handle earth magic at all, only to be destroyed by the monster when she confronted him after realizing that everything in her life had been the demons fault. The giant entity tried to escape but after a fierce battle Kazuma, Ayano and Ren were able to defeat him, but only after Ayumi used a big amount of her energy to stop him. This caused her to extinguish the remainings of her life energy, becuase, as they figured out later, she had been created in a very short time thanks to a magical amulet that belonged to the pixies, and as a result of that her life spawn was realy short. She died in Ren hand and with her last word she told him that she loved him.