Sumeragi, Matoi

皇まとい

Matoi moves in with her father at the start of the series, long after her mother's mysterious disappearance. She hopes to spend her days as an ordinary girl.
Her plans are disrupted, however, when a being from a higher dimension (also known as a god) becomes attached to her while she works at her uncle's shrine, enabling her to transform through a process called "Divine Union."

Spoiler