Ai is from a family is a long history of witches. However, only females in the family can become witches, and males born into the family are usually born to be cursed with bad health, which is her brother's problem. He's sick with a terminal illness, but there seems to be a chance she can save him if she can become a witch. (Source: Wikipedia)

Ai is from a family is a long history of witches. However, only females in the family can become witches, and males born into the family are usually born to be cursed with bad health, which is her brother's problem. He's sick with a terminal illness, but there seems to be a chance she can save him if she can become a witch. (Source: Wikipedia)