Dreamin'Halloween

The story is about our protagonist, an ancient human who doesn't care if she is called a witch. Living in an eternity where death does not exist, the meaning and enjoyment of life is increasingly vague. Her only job is to give candy to the three guardians of the gates of the magical world on Halloween, but it's only two weeks away. Will she be able to give them the candy they want?

[From UraOtome]