An ancient witch who ended up bringing calamity to the Witch Realm due to various factions fighting each other in order to take advantage of her vast powers.

In order to stop the fighting, a seal was placed on her, putting her in stasis before the seeds of evil implanted by an evil witch in her soul could corrupt her heart completely. However, due to the strengths of her powers, the two sides of her soul gained form even without the body and began an endless struggle. It was during this struggle that Arusu became caught in the middle. Arusu realized that in truth, both sides were still of the same heart that just feared to truth itself, and released Toma from her stasis.

In the end, the long stasis was able to give her the chance to gain control over her great magic, and with the command from the Grand Master of Witches, she ended up serving under Atelia.